Universe Today

February 19, 2014December 23, 2015 by Katrina Cain

Book Review and Giveaway: Women in Space by Karen Bush Gibson

On July 23rd, 2012, Sally Ride died. As the first American woman in space and a true icon of the modern scientific era, her loss was felt all over the world. President Barack Obama said, “Sally was a national hero and a powerful role model. She inspired generations of young girls to reach for the stars.” Ride’s, well, ride into space was wonderfully inspiring, but how many Americans ever read of Kathryn D. Sullivan, Anna Lee Fisher, or the dozens of other American women in space? Outside of space enthusiasts, few people know that the first woman in space was actually a Russian cosmonaut, Valentina Tereshkova, who visited the cosmos nearly 20 years before Ride! While Mae Jemison has reached international fame as a physician and the first African American women in space, few know of the African American women who came after her.

Thanks to our natural, but foolish, inclination to focus on “firsts” and benchmarks as if collecting trivia, it’s elusively easy to believe that these two or three women mentioned in our high-school science texts are the definitive ‘women of space’ and that’s that.

Hardly.

As accomplished author Karen Bush Gibson shows in her latest book, Women in Space: 23 Stories of First Flights, Scientific Missions, and Gravity-Breaking Adventures, space is certainly not an all boy’s club. Throughout the just over 200-page book, Gibson relates the successes and setbacks of nearly two dozen women from ten different countries who made history and forged a path for countless females to follow. Gibson’s book features photographs and nods to access additional learning resources, valuable for any interested reader in showing that this book is truly only just scratching the surface of women’s enormous impact on spaceflight.

Studies seem to pour in almost daily stating that the STEM (Science, Technology, Engineering, Math) fields are increasingly male-dominated, so it’s refreshing to read about the women who overcame the stereotypes and prejudices and dared to go where so few had gone before. Gibson’s book offers an informative, introductory overview of a group of unfortunately under-appreciated heroes – as well as an exhilarating perspective which emphasizes that there is so much more to come.

You can buy a copy of Women in Space from Amazon.com or visit the Chicago Review Press.

Universe Today and Chicago Review Press are pleased to be able to offer two free copies of Women in Space to our readers. In order to be entered into the giveaway drawing, just put your email address into the box at the bottom of this post (where it says “Enter the Giveaway”) before Wednesday. February 26. If this is the first time you’re registering for a giveaway, you’ll receive a confirmation email immediately where you’ll need to click a link to be entered into the drawing. For those who have registered previously, you’ll receive an email later where you can enter this drawing.

February 19, 2014December 23, 2015 by Shannon Hall

Is Eta Carinae Heading Toward Another Eruption?

Massive stars can devastate their surroundings, unleashing hot winds and blasting radiation. With a mass over 100 times heavier than the Sun and a luminosity a million times brighter than the Sun, Eta Carinae clocks in as one of the biggest and brightest stars in our galaxy.

The enigmatic object walks a thin line between stellar stability and tumultuous explosions. But now a team of international astronomers is growing concerned that it’s leaning toward instability and eruption.

In the 19th Century the star mysteriously threw off unusually bright light for two decades in an event that became known as the “Great Eruption,” the causes of which are still up for debate. John Herschel and others watched as Eta Carinae’s brightness oscillated around that of Vega — rivaling a supernova explosion.

We now know the star ejected material in the form of two big globes. “During the eruption the star threw off more than 10 solar masses, which can now be observed as the surrounding bipolar nebula,” said lead author Dr. Andrea Mehner from the European Southern Observatory. Miraculously the star survived, but the nebula has been expanding into space ever since.

Eta Carinae has been observed at the South African Astronomical Observatory — a 0.75m telescope outside of Cape Town — for more than 40 years, providing a wealth of data. From the start of observations in 1976 until 1998, astronomers saw an increase across the J, H, K and L bands — filters, which allow certain wavelength ranges of infrared light to pass through.

“This data set is unique for its consistency over a timespan of more than 40 years,” Mehner told Universe Today. “It provides us with the opportunity to analyze long-term changes in the system as Eta Carinae still recovers from its Great Eruption.”

In order to understand the longterm overall increase in light we have to look at a more recent discovery noted in 2005 when scientists discovered that Eta Carinae is actually two stars: a massive blue star and a smaller companion. The temperature increased for 15 years until the companion came very close to the massive star, reaching periastron.

This increase in brightness is likely due to an overall increase in temperature of some component of the Eta Carinae system (which includes the massive blue star, its smaller companion, and the shells of gas and dust that now enshroud the system).

After 1998, however, the linear trend changed significantly and the star’s brightness increased much more rapidly in the J and H bands. It’s getting bluer, which in astronomy, typically means it’s getting hotter.

However, it’s unlikely the star itself is getting hotter. Instead we are seeing the effect of dust around the star being destroyed rapidly. Dust absorbs blue light. So if the dust is getting destroyed, more blue light will be able to pass through the nebulous globes surrounding the system. If this is the case, then we’re really seeing the star as it truly is, without dust absorbing certain wavelengths of its light.

While the nebula is slowly expanding and the dust is therefore dissipating, the authors do not think it’s enough to account for the recent brightening. Instead Eta Carinae is likely rotating at a different speed or losing mass at a different rate. “The changes observed may imply that the star is becoming more unstable and may head towards another eruptive phase,” Mehner told Universe Today.

Perhaps Eta Carinae is heading toward another “Great Eruption.” Only time will tell. But in a field where most events occur on a timescale of millions of years, it’s a great opportunity to watch the system evolve on a human time scale. And when Eta Carinae reaches periastron in the middle of this year, tens of telescopes will be collecting its light, hoping to see a sudden turn of events that may help us explain this exotic system.

The paper has been accepted for publication in Astronomy & Astrophysics and is available for download here.

February 19, 2014December 23, 2015 by David Dickinson

Dazzling New Views of a Familiar Cluster

Wow. It’s always amazing to get new views of familiar sky targets. And you always know that a “feast for the eyes” is in store when astronomers turn a world-class instrument towards a familiar celestial object.

Such an image was released this morning from the European Southern Observatory (ESO). Astronomers turned ESO’s 2.2-metre telescope towards Messier 7 in the constellation Scorpius recently, and gave us the star-studded view above.

Also known as NGC 6475, Messier 7 (M7) is an open cluster comprised of over 100 stars located about 800 light years distant. Located in the curved “stinger” of the Scorpion, M7 is a fine binocular object shining at a combined magnitude of about +3.3. M7 is physically about 25 light years across and appears about 80 arc minutes – almost the span of three Full Moons – in diameter from our Earthly vantage point.

One of the most prominent open clusters in the sky, M7 lies roughly in the direction of the galactic center in the nearby astronomical constellation of Sagittarius. When you’re looking towards M7 and the tail of Scorpius you’re looking just south of the galactic plane in the direction of the dusty core of our galaxy. The ESO image reveals the shining jewels of the cluster embedded against the more distant starry background.

Messier 7 is middle-aged as open clusters go, at 200 million years old. Of course, that’s still young for the individual stars themselves, which are just venturing out into the galaxy. The cluster will lose about 10% of its stellar population early on, as more massive stars live their lives fast and die young as supernovae. Our own solar system may have been witness to such nearby cataclysms as it left its unknown “birth cluster” early in its life.

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Other stars in Messier 7 will eventually mature, “join the galactic car pool” in the main sequence as they disperse about the plane of the galaxy.

But beyond just providing a pretty picture, studying a cluster such as Messier 7 is crucial to our understanding stellar evolution. All of the stars in Messier 7 were “born” roughly around the same time, giving researchers a snapshot and a chance to contrast and compare how stars mature over there lives. Each open cluster also has a unique spectral “fingerprint,” a chemical marker that can even be used to identify the pedigree of a star.

For example, there’s controversy that the open cluster Messier 67 may actually be the birth place of our Sun. It is interesting to note that the spectra of stars in this cluster do bear a striking resemblance in terms of metallicity percentage to Sol. Remember, metals in astronomer-speak is any element beyond hydrogen and helium. A chief objection to the Messier 67 “birth-place hypothesis” is the high orbital inclination of the open cluster about the core of our galaxy: our Sun would have had to have undergone a series of improbable stellar encounters to have ended up its current sedate quarter of a billion year orbit about the Milky Way galaxy.

Still, this highlights the value of studying clusters such as Messier 6. It’s also interesting to note that there’s also data in what you can’t see in the above image – dark gaps are thought to be dust lanes and globules in the foreground. Though there is some thought that this dust is debris that may also be related to the cluster and may give us clues as to its overall rotation, its far more likely that these sorts of “dark spirals” related to the cluster have long since dispersed. M7 has completed about one full orbit about the Milky Way since its formation.

Another famous binocular object, the open cluster Messier 6 (M6) also known as the Butterfly Cluster lies nearby. Messier 7 also holds the distinction as being the southernmost object in Messier’s catalog. Compiled from Parisian latitudes, Charles Messier entirely missed southern wonders such as Omega Centauri in his collection of deep sky objects that were not to be mistaken for comets. We also always thought it curious that he included such obvious “non-comets” such as the Pleiades, but missed fine northern sky objects as the Double Cluster in the northern constellation Perseus.

Finding Messier 6: the view from latitude 30 degrees north before dawn in mid-February. Credit: Stellarium.

Messier 7 is also sometimes called Ptolemy’s Cluster after astronomer Claudius Ptolemy, who first described it in 130 A.D. as the “nebula following the sting of Scorpius.” The season for hunting all of Messier’s objects in an all night marathon is coming right up in March, and Messier 7 is one of the last targets on the list, hanging high due south in the early morning sky.

Interested in catching how Messier 7 will evolve, or might look like up close? Check out Messier 45 (the Pleiades) and the V-shaped Hyades high in the skies in the constellation Taurus at dusk to see what’s in store as Messier 7 disperses, as well as the Ursa Major Moving Group.

And be sure to enjoy the fine view today of Messier 7 from the ESO!

Got pics of Messier 7 or any other deep sky objects? Send ’em, in to Universe Today!

February 19, 2014December 23, 2015 by Elizabeth Howell

Gaping Inside The Huge Vehicle Assembly Building NASA Used For Space Shuttles And Moon Missions

The Vehicle Assembly Building at the Kennedy Space Center in Florida on Nov. 16, 2009, just hours before the launch of STS-129. Credit: Elizabeth Howell

ORLANDO, FLORIDA – There’s something about this city that brings out the crazy travel planner in me. I visited here four times betting a shuttle would launch, luckily winning on three occasions. I also once took an epic bus trip from here as far south as Fort Lauderdale before zooming back north, looking at space exhibits up and down the coast.

This time, it was to catch the Vehicle Assembly Building tour before it was gone. Tours inside the iconic, huge structure — best known as the spot where the Apollo rockets and space shuttle went through final assembly before going to the pad — are closing down on Sunday (Feb. 23). Warned by Ken Kremer and others that soon the public couldn’t get inside, I booked a ticket late last month after the announcement was made.

I came in search of the past, but what I saw instead was the future — an agency preparing to hand over a launch pad to SpaceX, and at least part of an Orion spacecraft on the VAB floor, ready to be shipped to Langley, Virginia.

The floor of the Vehicle Assembly Building at the Kennedy Space Center in Florida during a tour in February 2014. At left is an Orion spacecraft prototype readied for shipping to Langley, Virginia. Credit: Elizabeth Howell

Atlantis suspended in the Vehicle Assembly Building during the shuttle era. Image credit: NASA

It’s hard to convey the size of one of the world’s largest buildings. It’s so big that it can form its own weather inside, without proper air conditioning. It stands almost twice as high as the Statue of Liberty, at 160 meters (525 feet) tall and 158 meters (518 feet) wide.

The 3.25-hectare (8-acre) building needed to be so huge to hold the 363-foot (111-meter) Apollo/Saturn vehicles in the 1960s and 1970s, and then was modified for use of the shuttle in the 1970s until just a few years ago.

What surprised me, however, was how narrow the main floor appeared. That’s because there are all of these catwalks on either side of the space for workers to get access to different parts of the spacecraft.

A view of scaffolding inside the Vehicle Assembly Building at the Kennedy Space Center in Florida. Photo taken in February 2014. Credit: Elizabeth Howell

Tours of this building were off-limits between 1978 and 2011, when the shuttle program was launching its vehicles in earnest. After the program retired, however, NASA opened the VAB and nearby facilities (including the Launch Control Center and Launch Pad 39A) up to visitors. As these areas are now being used by contractors and the Orion/Space Launch System, however, the agency is closing down public access so the work of getting to space can continue.

As NASA prepares for a test of Orion later in 2014, the agency is also looking to lease out parts of the big building to commercial vendors. It appears negotiations for at least some of the high bays are ongoing.

Meanwhile, we were lucky enough to glimpse at least part of an Orion spacecraft prototype ready for shipping to Langley, Virginia, with about a dozen people busily milling around it as it lay on the back of a tractor trailer. It’s unclear to me how much of the spacecraft was inside that package, but our tour guide told us it was the whole thing. Yes, the truck looked really tiny in the big building.

An Orion prototype spacecraft in the Vehicle Assembly Building at the Kennedy Space Center in Florida, ready to be shipped to Langley, Virginia. Credit: Elizabeth Howell

Our group also had the chance to visit Launch Pad 39A, one of the two pads used in the Apollo program and also for shuttle. It was eerie to see the pad still in its shuttle configuration, complete with the clamshell-like structure that used to protect the vehicle from the weather until just prior to launch.

All that is going to be torn down for scrap shortly as SpaceX likely takes over the pad, our guide told us, and it’s unclear how long pad tours will continue. Likely those will be gone soon as well. Meanwhile, I took special delight standing in the “flame trench” where noxious chemicals from the launch used to flow. You certainly didn’t want to be close to this spot when a Saturn V or shuttle stack took off.

By the way, the first thing I thought of when I saw the huge pipes on the side of the picture below is the 1996 movie Apollo 13, which has a dramatic launch sequence that includes a neat pan across the coolant tubing. That’s about the time when I decided I wanted to see the VAB and launch pads, so it only took me 18 years to get out here.

Launch Pad 39A at the Kennedy Space Center, one of two locations where the shuttle went into space. Photo taken in February 2014. Credit: Elizabeth Howell

Although these tours are likely changing or closing, these steps are to get the complex ready for manned launches again, if the current plan and funding holds as NASA hopes.

In the meantime, there are other things to see at the center. The picture at the top of this article shows the Vehicle Assembly Building just before the launch of STS-129, my first experience seeing a shuttle rocket into space.

That shuttle happened to be Atlantis, which today is handily displayed nearby in the KSC Visitor Complex. Weird, I thought, as I looked at the immense vehicle’s bulk. The last time I saw you in November 2009, you were on your way to orbit and making a lot of noise.

I wonder how much things will change at KSC in the next four years.

The Atlantis space shuttle at the Kennedy Space Center in Florida in February 2014. Credit: Elizabeth Howell

February 18, 2014December 23, 2015 by Jason Major

Keeping An Eye On Gaia

ESA's Gaia spacecraft as seen by the VLT (Credit: ESO)

Gaia, ESA’s long-anticipated mission to map the stars of our galaxy (as well as do a slew of other cool science things) is now tucked comfortably in its position in orbit around Earth-Moon L2, a gravitationally stable spot in space 1.5 million km (932,000 miles) away.

Once its mission begins in earnest, Gaia will watch about a billion stars an average of 70 times each over a five-year span… that’s 40 million observations every day. It will measure the position and key physical properties of each star, including its brightness, temperature and chemical composition, and help astronomers create the most detailed 3D map of the Milky Way ever.

But before Gaia can do this, its own position must be precisely determined. And so several of the world’s most high-powered telescopes are trained on Gaia, keeping track daily of exactly where it is up to an accuracy of 150 meters… which, with the ten-meter-wide spacecraft one and a half million kilometers away, isn’t too shabby.

Called GBOT, for Ground Based Orbit Tracking, the campaign to monitor Gaia’s position was first set up in 2008 — long before the mission launched. This allowed participating observatories to practice targeting on other existing spacecraft, like NASA’s WMAP and ESA’s Planck space telescopes.

The image above shows an image of Gaia (circled) as seen by the European Southern Observatory’s Very Large Telescope Survey Telescope (VST) atop Cerro Paranal in Chile, one of the supporting observatories in the GBOT campaign. The images were taken with the 2.6-meter Survey Telescope’s 268-megapixel OmegaCAM on Jan. 23, 6.5 minutes apart. With just the reflected sunlight off its circular sunshield, the distant spacecraft is about a million times fainter than what your eyes could see unaided.

Gaia mapping the stars of the Milky Way. (ESA/ATG medialab; background: ESO/S. Brunier)

It’s also one the closest objects ever imaged by the VST.

Currently Gaia is still undergoing calibration for its survey mission. Some problems have been encountered with stray sunlight reaching its detectors, and this may be due to the angle of the sunshield being a few degrees too high relative to the Sun. It could take a few weeks to implement an orientation correction; read more on the Gaia blog here.

Of the billion stars Gaia will observe, 99% have never had their distances accurately measured. Gaia will also observe 500,000 distant quasars, search for brown dwarfs and exoplanets, and will conduct experiments testing Einstein’s General Theory of Relativity. Find out more facts about the mission here.

Gaia launched on December 19, 2013, aboard a Soyuz VS06 from ESA’s spaceport in Kourou, French Guiana. Watch the launch here.

Source: ESA

February 18, 2014December 23, 2015 by Nancy Atkinson

Runaway Pulsar Produces Longest Jet Trail Ever Observed

An extraordinary jet trailing behind a runaway pulsar is seen in this composite image. Credit: X-ray: NASA/CXC/ISDC/L.Pavan et al, Radio: CSIRO/ATNF/ATCA Optical: 2MASS/UMass/IPAC-Caltech/NASA/NSF

One of the fastest-moving pulsars ever observed is spewing out a record-breaking jet of high-energy particles that stretches 37 light years in length – the longest object in the Milky Way galaxy.

“We’ve never seen an object that moves this fast and also produces a jet,” said Lucia Pavan of the University of Geneva in Switzerland and lead author of a paper analyzing the object. “By comparison, this jet is almost 10 times longer than the distance between the sun and our nearest star.”

The pulsar, a type of neutron star, is has the official moniker of IGR J11014-6103, but is also known as the “Lighthouse nebula.” Astronomers say the pulsar’s corkscrew-like trajectory can likely be traced back to its birth in the collapse and subsequent explosion of a massive star. The curly-cue pattern in the trail suggests the pulsar is wobbling like a spinning top.

The team says that their findings suggest that “jets are common to rotation-powered pulsars, and demonstrate that supernovae can impart high kick velocities to misaligned spinning neutron stars, possibly through distinct, exotic, core-collapse mechanisms.”

The object was first seen by the European Space Agency satellite INTEGRAL. The pulsar is located about 60 light-years away from the center of the supernova remnant SNR MSH 11-61A in the constellation of Carina. Its implied speed is between 4 – 8 million km/hr (2.5 million and 5 million mph), making it one of the fastest pulsars ever observed.

IGR J11014-6103 also is producing a cocoon of high-energy particles that enshrouds and trails behind it in a comet-like tail. This structure, called a pulsar wind nebula, has been observed before, but the Chandra data show the long jet and the pulsar wind nebula are almost perpendicular to one another.

Usually, the spin axis and jets of a pulsar point in the same direction as they are moving.

“We can see this pulsar is moving directly away from the center of the supernova remnant based on the shape and direction of the pulsar wind nebula,” said co-author Pol Bordas, from the University of Tuebingen in Germany. “The question is, why is the jet pointing off in this other direction?”

One possibility requires an extremely fast rotation speed for the iron core of the star that exploded. A problem with this scenario is that such fast speeds are not commonly expected to be achievable.

“With the pulsar moving one way and the jet going another, this gives us clues that exotic physics can occur when some stars collapse,” said co-author Gerd Puehlhofer also of the University of Tuebingen.

Read the team’s paper.

Source: Chandra

February 18, 2014December 23, 2015 by Nancy Atkinson

Quantum Entanglement Explained

A frame from the 'Quantum Entanglement Animated' video, via QuantumFrontiers.com

Confused by how particles can be in two places at once? Wondering how particles can instantly communicate with each other no matter what the distance? Quantum physics is a field of study that defies common sense at every turn, and quantum entanglement might lead the way in the defying common sense department. Entanglement is the unusual behavior of elementary particles where they become linked so that when something happens to one, something happens to the other; no matter how far apart they are. This bizarre behavior of particles that become inextricably linked together is what Einstein supposedly called “spooky action at a distance.”

This new video from PHD Comics provides a combination of live action and animation to try to explain entanglement.

“Not surprisingly, it was really hard to draw this video,” says animator Jorge Cham. “How do you depict something that has never existed before? And more importantly, do you draw alligators differently from crocodiles?”
Yes, that sentence actually makes sense when it comes to entanglement. And the advice at the end of the video from physicist Jeff Kimble is applicable to entanglement — and life in general — as well: “If you know what you’re doing, don’t do it…”

February 18, 2014December 23, 2015 by Bob King

‘Moby Dick’ Asteroid 2000 EM26 is Missing – Help Astronomers Find It

Yesterday evening you may have dropped by to watch Slooh’s live coverage of asteroid 2000 EM26 as it passed just 8.8 lunar distances of Earth. Surprise – the space rock never showed up! Slooh’s robotic telescope attempted to recover the asteroid and share its speedy travels with the world but failed to capture an image at the predicted position.

Now nicknamed Moby Dick after the elusive whale in Herman Melville’s novel of the same name, the asteroid’s gone missing in the deep sea of space. Earthlings need fear no peril; it’s not headed in our direction anytime soon. Either the asteroid’s predicted path was in error or the object was much fainter than expected. More likely the former.

Last night’s coverage attempt of 2000 E26’s close flyby of Earth

2000 EM26’s predicted brightness at the time was around magnitude 15.4, not bright but well within range of the telescope. Rather than throwing their hands up in the air, the folks at Slooh are calling upon amateur astronomers make a photographic search for the errant space rock in the next few nights.

Since the asteroid was last observed 14 years ago for only 9 days, it isn’t too surprising that uncertainties in its position could add up over time, shifting the asteroid’s position and path to a different part of the sky by 2014. According to Daniel Fischer, German amateur astronomer and astronomy writer, the positions were off by 100 degrees! As Paul Cox, Slooh’s Observatory Director, points out:

“Discovering these Near Earth Objects isn’t enough. As we’ve seen with 2000 EM26, all the effort that went into its discovery is worthless unless followup observations are made to accurately determine their orbits for the future. And that’s exactly what Slooh members are doing, using the robotic telescopes at our world-class observatory site to accurately measure the precise positions of these asteroids and comets.”

If a determined, modern-day Ahab doesn’t find this asteroidal Moby Dick, one of the large scale robotic telescope surveys probably will. Here’s a link to the NASA/JPL particulars including brightness, coordinates and distance for 2000 EM26.

Similar sized asteroids, including ones passing even closer to Earth, zip by every month. 2000 EM26 received a lot of coverage yesterday likely because it arrived near the time of the anniversary of the Chelyabinsk meteorite fall over Russia. Though it remains scarce for now, eyes are on the sky to find the asteroid again and refine its orbit. Hopefully the beast won’t get away next time.

Check out the lively discussion going on at Asteroid and Comet Researcher List. More information HERE.

February 18, 2014December 23, 2015 by Shannon Hall

NSF Report Biased, Expert Says: Americans Don’t Think Astrology is Scientific

Every Thanksgiving when I was home from college, at least one family member would turn to me and ask me how that astrology degree was going, or tell me about a new astrology article they read. It wasn’t that my family members really thought I was studying astrology or even believed astrology was scientific, it was just that they mixed up “astronomy” with “astrology.” In all fairness, for those who don’t follow either astrology or astronomy very closely, it might be considered an honest mistake.

So when a report from the National Science Foundation claimed a majority of young Americans believed astrology was scientific I had my doubts. But so did psychologist, Richard Landers from Old Dominion University who performed a small second study and found the report to be biased.

Since 1979, NSF surveys have asked Americans whether they view astrology — the study of how the movement of celestial bodies affects the here and now — as being scientific.

Their most recent survey showed that nearly half of all Americans (42 percent) believe astrology to be scientific. But what’s more alarming, according to the NSF, is that American understandings of science are moving in the wrong direction. It seems our golden year was in 2004, when 66 percent of Americans said astrology was not at all scientific. That number has been dropping ever since.

It should come as no surprise that those with a higher education are more willing to demote astrology entirely. In 2012, 72 percent of those with graduate degrees indicated that astrology is not scientific, compared with only 34 percent of those who didn’t graduate high school.

Shockingly, age was also related to perceptions of astrology. Younger respondents (ages 18-24) seemed to give astrology a high vote of confidence,with only 42 percent claiming that it isn’t scientific. So roughly six in every 10 young adults believe astrology is absolutely scientific.

But such dramatic conclusions are being drawn from a single question: “Is astrology scientific?” It’s based on the crucial assumption that people are correctly interpreting the word “astrology.”

Landers guessed that the survey respondents might be mixing up the term “astrology” with “astronomy.” So he performed a quick survey himself, using Amazon Mechanical Turk (MTurk) — a crowdsourcing internet marketplace. He collected 100 responses to a survey that asked three questions:

— Please define astrology in 25 words or less.
— Do you believe astrology to be scientific?
— What is your highest level of education completed?

His initial assessment — without taking into account how the respondent defined astrology — showed results very similar to the original survey provided by the NSF — approximately 30 percent found astrology to be scientific. While this percentage is less than what the NSF report found, Landers believes this is due to a user bias (MTurk users tend to be more educated and older than the average American).

But once Landers included the answer to the first question into his results, he saw a very clear trend: those who defined astrology correctly did not believe it to be scientific, while those who confused astrology with astronomy did believe it to be scientific.

Data collected from 100 participants using MTurk. Image Credit: R. Landers

Among those that correctly identified astrology, only 13.5 percent found it to be “pretty scientific.” And only one person found it to be “very scientific.” Among those that confused astrology with astronomy, the discipline was overwhelmingly seen as scientific.

“My little quick study doesn’t ‘overturn’ the NSF results” Landers told Universe Today. “It only suggests that the NSF results are probably biased to some degree.”

With such small number statistics Landers certainly didn’t prove the NSF results wrong, but he does call the study into question. Landers also noted an additional study from the European Commission which corroborated his findings.

I for one would love to see the NSF conduct a more detailed study. Including a definition of astrology in the next round of surveys would certainly bring clarification and shed light on the root of the problem.

—

Update: After posting this article, a reader informed me of a critique of Richard landers’ assessment, posted by The Washington Post’s Jim Lindgren. He conducted another follow-up study to explore the issue. In his own sample, Lindgren found that probably only one respondent out of 108 confused “astrology” with “astronomy.” He claims it’s unlikely the NSF report was biased at all.

However, the back and forth banter between experts suggests these words and their corresponding definitions do need to be clarified. Science journalists have their work cut out for them.

February 18, 2014December 23, 2015 by David Dickinson

Now’s the Time to See Asteroid Pallas at its Best

Looking for something off of the beaten celestial path to observe? The coming weeks will offer telescope users a rare chance to catch a well known asteroid, as it puts on its best show for over two decades.

Over the coming weeks, 2 Pallas, one of the “big four” asteroids – or do you say minor/dwarf planet/planetoid? – reaches a favorable observing point known as opposition. Gliding northward through the constellations of Hydra and Sextans through February and March 2014, 2 Pallas presents a favorable binocular challenge for both northern and southern hemisphere observers as it rises to the east opposite to the setting Sun and transits the local meridian around midnight.

And although 2 Pallas reaches opposition roughly every 16 months as seen from our Earthly vantage point, 2014 provides a chance to catch it under exceptional circumstances. And to top it off, the other “Big 4” asteroids – 1 Ceres, 3 Juno and 4 Vesta – are all currently visible as well and reach opposition in the January through April time frame.

Pallas HST — 2 Pallas as imaged by the Hubble Space Telescope. Credit: NASA

Pallas and its brethren also have a checkered history though the course of 19^th century astronomy. The second minor planet to be discovered, Heinrich Wilhelm Olbers spied 2 Pallas near opposition on the night of March 28^th, 1802. Olbers made this discovery observing from his home rooftop observatory in Bremen, Germany using a five foot – telescopes were often measured in focal length rather than aperture in those days – Dollond refractor.

Olbers discovered 2 Pallas on the border of the astronomical constellations of Virgo and Coma Berenices shining at magnitude +7.5.

Pallas orbit — A simulation of the orbit of 2 Pallas near opposition this month. Credit: NASA/JPL Horizons.

If the name Olbers sounds familiar, it’s because he also lent it to the paradox that now bears his name. Obler’s paradox was one of the first true questions in cosmology posed in a scientific framework that asked: if the universe is actually infinite in time and space, then why isn’t the sky infinitely bright? And, on a curious side note, it was American horror author Edgar Allan Poe that delivered the answer.

But now back to our solar system. Olbers also discovered 4 Vesta just five years after Pallas.

He was definitely on a roll. The discoveries of these space rocks also grabbed the attention of Olbers contemporary, Johann Bode. Bode had formulated a law now known as the Titus-Bode Law that seemed to put the spacing of then known bodies of the solar system in tidy order. In fact, the Titus-Bode law seemed to predict that a body should lie between Mars and Jupiter, and for a brief time in the 18^th century — and again in 2006 when the International Astronomical Union let Eris and Pluto in the door before kicking them back out — Ceres, Pallas, Juno and Vesta were all considered planets.

Comparison — A size comparison of the first ten asteroids discovered compared to Earth’s moon. Wikimedia Commons graphic in the Public Domain.

Today, we now know that 2 Pallas is a tiny world about 575 kilometres in diameter. 2 Pallas orbits the Sun once every 4.62 years and has a relatively high inclination of 34.8 degrees relative to the ecliptic. Pallas has no confirmed satellites, though one was once hinted at during a May 29th, 1979 stellar occultation. And though we’ve yet to send a mission to examine Pallas up close, there were early planning considerations to send NASA’s Dawn spacecraft there after its visit to 1 Ceres.

wide — The path of 2 Pallas from February 16th though March 21st. Created by the author using Stellarium.

This month, look for 2 Pallas as a +7^th magnitude wandering star at dusk. Mid-February finds 2 Pallas in the constellation Hydra, and it crosses briefly into Sextans starting on March 22^nd until it passes just three degrees east of the 2nd magnitude Alphard (Alpha Hydrae) on March 1^st, making a good guidepost to find it at its brightest.

2 Pallas last broke +7^th magnitude visibility as seen from Earth in 1991 and won’t do so again til 2028. This is because 18.5 Earth years very nearly equals four orbits of Pallas around the Sun, bringing the two worlds back “into sync.” According to calculations by Belgian astronomer Jean Meeus, the 2014 opposition season offers the closest passage to Earth for Pallas from 1980-2060. Pallas can appear at a maximum brightness of magnitude +6.5 — just on the threshold of naked eye visibility — as seen from Earth.

Narrow — A narrow field finder chart for 2 Pallas with sample comparison magnitudes, decimal points omitted. Created by the author using Stellarium.

Opposition for Pallas occurs on February 22^nd, 2014, when the asteroid is 1.23 AUs distant from our fair planet. Watch for 2 Pallas near opposition this year moving at just under half a degree a day — about the diameter of the Full Moon — headed northward at closest approach.

Hunting asteroids at the eyepiece can be a challenge, as they visually resemble pinpoint stars and show no apparent disks even at high magnification. Sketching or photographing the field of view on successive nights is a fun and easy way to cross this object off of your life list. For those who own scopes with digital setting circles, Heavens-Above is a great quick look source for current coordinates.

2 Pallas just passed perihelion at 2.13 Astronomical Units from the Sun on December 6^th, 2013, and passes closest to Earth on February 24^th at 1.2 A.U.s distant.

Don’t miss the chance to spy this fascinating an enigmatic worldlet coming to a sky near you this season!

-Got pics of 2 Pallas and friends? Be sure to send ‘em in to Universe Today!