Elizabeth Howell, Author at Universe Today

April 2, 2014December 23, 2015 by Elizabeth Howell

Tranquil-Looking Galaxy Bears ‘Battle Scars’ From Ancient Struggles

NGC 1316 (left) and its smaller companion galaxy NGC 1317. Image taken with the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in Chile. Credit: ESO

Shining 60 million light-years away all serene-looking is NGC 1316 (left) and a smaller galaxy NGC 1317. This new picture from the European Southern Observatory’s La Silla Observatory in Chile, however, reveals “battle scars” of ancient fights, the observatory stated.

“Several clues in the structure of NGC 1316 reveal that its past was turbulent. For instance, it has some unusual dust lanes embedded within a much larger envelope of stars, and a population of unusually small globular star clusters. These suggest that it may have already swallowed a dust-rich spiral galaxy about three billion years ago,” the European Southern Observatory stated.

“Also seen around the galaxy are very faint tidal tails — wisps and shells of stars that have been torn from their original locations and flung into intergalactic space. These features are produced by complex gravitational effects on the orbits of stars when another galaxy comes too close. All of these signs point to a violent past during which NGC 1316 annexed other galaxies and suggest that the disruptive behavior is continuing.”

You might better known NGC 1316 as Fornax A, the brightest radio source in the constellation Fornax and the fourth-brightest source in the sky. This is due to its supermassive black hole sucking up material in the area — and could actually be stronger because of the close encounters with other galaxies.

This image is a composite of archival pictures from the telescope. If you look closely, you can spot some fainter galaxies in the background, too.

Source: ESO

April 1, 2014December 23, 2015 by Elizabeth Howell

Neil Armstrong: Why The World Needs ‘Nerdy Engineers’ (In Animated Form)

Neil Armstrong at a gala celebrating NASA's 50th anniversary in September 2008. Credit: NASA/Paul Alers

Combine the gravitas of humanity’s first moon visitor with the whimsy of animation, and the result is pure fun. Here, you can see part of Neil Armstrong’s address to the National Press Club on Feb. 22, 2000 about how engineering made the world a lot better in the past century. Providing animation is PhD Comics creator Jorge Cham.

“Engineering helped create a world in which no injustice could be hidden,” the retired NASA astronaut (now deceased) said in that speech, explaining that engineering is more focused on envisioning possibilities than the facts-based science professions.

While Armstrong makes no direct reference to his historic 1969 moon landing in the speech, the animation is peppered with references including the famous “bootprint” picture taken by his crewmate, Buzz Aldrin.

We’d be interested in knowing what scientists or science fans think of his point of view. Is Armstrong’s view too limited for science, or an accurate description? Watch the video, and let us know in the comments.

April 1, 2014December 23, 2015 by Elizabeth Howell

SpaceX’s Next-Generation Reusable Rocket Roars In Tie-Down Test

The first stage of SpaceX's F9R rocket was tested in a "static fire" in March 2014. Credit: SpaceX/YouTube (screenshot)

As SpaceX pursues its quest of rocket reusability, it recently subjected the first stage of its next generation Falcon 9 rocket (called the Falcon 9-reusable or F9R) to a tie-down test ahead of some more heavy-duty work in the coming months and years. Early indications are that the test was a success, the firm said.

Details of the rocket are still scance on the SpaceX’s website, but the California-based company said that the rocket would generate about a million pounds of thrust at sea level, and 1.5 million pounds in space. It’s also a sort of follow-on from the leaping reusable Grasshopper rocket that retired last year.

Rockets are usually the “throwaway” items in a flight, but SpaceX is betting that by creating a reusable one that it will save on launch costs in the long run. (The rocket has been tested before, such as this long-duration one last June.)

“F9R test flights in New Mexico will allow us to test at higher altitudes than we are permitted for at our test site in Texas, to do more with unpowered guidance and to prove out landing cases that are more-flight like,” SpaceX stated in the YouTube video description.

SpaceX’s next launch to the space station was supposed to be in March, but it was scrubbed due to a radar outage that is affecting several launches. You can read more about the Falcon 9 rocket’s development (including the addition of landing legs) in this recent Universe Today article by Ken Kremer.

April 1, 2014December 23, 2015 by Elizabeth Howell

Starquake! How Super-Suns Swing, And What It Could Look Like

Artist's conception of a starquake cracking the surface of a neutron star. Credit: Darlene McElroy of LANL

Much like how an earthquake can teach us about the interior of the Earth, a starquake shows off certain properties about the inside of a star. Studying the closest star we have (the sun) has yielded information about rotation, radius, mass and other properties of stars that are similar to our own. But how do we apply that information to other types of stars?

A team of astronomers attempted to model the inside of a delta-Scuti, a star like Caleum that is about 1.5 to 2.5 times the mass of the sun and spins rapidly, so much more that it tends to flatten out. The model reveals there is likely a correlation between how these types of stars oscillate, and what their average density is. The theory likely holds for stars as massive as four times the mass of our sun, the team said.

“Thanks to asteroseismology we know precisely the internal structure, mass, radius, rotation and evolution of solar type stars, but we had never been able to apply this tool efficiently to the study of hotter and more massive stars,” stated Juan Carlos Suárez, a researcher at the Institute of Astrophysics of Andalusia who led the investigation.

Model of an oscillation within the sun. Credit: David Guenther, Saint Mary´s University

What’s more, knowing how dense a star is leads to other understandings: what its mass is, its diameter and also the age of any exoplanets that happen to be hovering nearby. The astronomers added that the models could be of use for the newly selected Planetary Transits and Oscillations (PLATO) telescope that is expected to launch in 2024.

A paper based on the research was published in Astronomy and Astrophysics and is also available in preprint form on Arxiv.

Source: The Institute of Astrophysics of Andalusia

March 31, 2014December 23, 2015 by Elizabeth Howell

Have A Heart! This Organ Plays Shape-Shifter In Space, Leading To Mars Mission Questions

Astronaut Piers Sellers during an STS-121 spacewalk in 2006 to demonstrate techniques on repairing the shuttle's heat shield. Credit: NASA

Could a long mission to Mars increase your risk of heart problems back on Earth? That’s something that scientists are trying to better understand after discovering that hearts become temporarily rounder in space, at least in a study of 12 astronauts.

The finding doesn’t appear to be a big surprise for cardiovascular scientists, however, who had the astronauts examine their hearts using ultrasound machines on the International Space Station as well as before and after spaceflight. The heart gets 9.4 percent more round, similar to models developed for the project, before returning to its normal shape on Earth.

“The heart doesn’t work as hard in space, which can cause a loss of muscle mass,” stated James Thomas, lead scientist for ultrasound at NASA, and senior author of the study. “That can have serious consequences after the return to Earth, so we’re looking into whether there are measures that can be taken to prevent or counteract that loss.”

Astronauts typically spend six months on the International Space Station. One year from now, NASA’s Scott Kelly and Roscomos’ Mikhail Kornienko are going to launch for a one-year mission. Spending months upon months in space leads to a host of problems upon returning to Earth. Your muscles get weaker, you’re more likely to pass out, and you’re at increased risk of bone fractures, among other problems.

NASA astronaut Norm Thagard exercises aboard the Russian Mir space station in 1995. Thagard was the first American to launch into space aboard a Soyuz and spent what was then a record-breaking 115 days in space. Credit: NASA

A typical person on the space station spends two hours a day exercising just to ward off the worst of the effects. The researchers added that one remedy could be to add more exercises targeting the heart. This will be particularly important for missions that last 12 to 18 months or more — such as a Mars mission.

Studying astronauts in space could provide data on Earth-bound patients facing similar problems, the researchers said. Since the models that they made for astronauts were so congruent with reality, this gives the researchers confidence that they could create similar models for patients on Earth.

Conditions that could be considered include ischemic heart disease (the most common kind of heart disease and source of heart attacks), hypertrophic cardiomyopathy (thickened heart muscle) and valvular heart disease (damage to one of the heart’s valves).

Results were presented last week at the American College of Cardiology’s annual conference. It’s not immediately clear from a press release if the study was peer-reviewed. The researchers added that more study of astronauts after returning to Earth could be a useful research direction, to see how the effects persist (if at all.)

Source: American College of Cardiology

March 31, 2014December 23, 2015 by Elizabeth Howell

Aurora Alert: Powerful Solar Flare This Weekend Could Spark Show Tomorrow

Extreme ultraviolet light streams out of an X-class solar flare as seen in this image captured on March 29, 2014, by NASA's Solar Dynamics Observatory. This image blends two wavelengths of light: 304 and 171 Angstroms, which help scientists observe the lower levels of the sun's atmosphere. Image Credit: NASA/SDO.

If you sit at a fairly high latitude, you may want to keep an eye out your window Tuesday (April 1) and Wednesday. A powerful X-1 class flare erupted from the sun on Saturday (March 29), sparking an active space weather forecast from the National Oceanic and Atmospheric Administration.

The solar flare erupted from sunspot AR2017 and happened to be aimed at the right direction to bring material to Earth. The associated coronal mass ejections (CMEs) will send streams of particles towards our planet, which could get pulled towards the poles and cause light shows as they interact with molecules in the upper atmosphere.

“NOAA forecasters estimate a 35 percent to 60 percent chance of polar geomagnetic storms on April 1-2 when at least three CMEs are expected to deliver glancing blows to Earth’s magnetic field,” SpaceWeather.com wrote. “The best-guess forecast calls for minor G1-class storms. High-latitude sky watchers should be alert for auroras.”

Aurora seen near Fairbanks, Alaska on March 21, 2014. Credit and copyright: John Chumack.

At the top of this story, you can view a video of the flare from the Solar Dynamics Observatory, a NASA satellite launched in 2010 to observe the sun’s activity. This not only has applications for aurora watchers, but also for those people concerned about the effect CMEs have on Earth’s satellites, power lines and other sensitive infrastructure.

Below is an older picture from the Solar and Heliospheric Observatory, a joint NASA and European Space Agency mission that also keeps an eye on solar activity. The sun has an 11-year cycle of solar activity, and you can see peak year 2001 at the front of the image along with quieter years 1996 and 2006 near the back. The year 2014 is just off the peak for this solar cycle.

If you catch a light show, be sure to post it on the Universe Today Flickr pool, and we may include it in a future story!

A solar cycle in X-rays. The peak in 2001 is visible at the front, with quietest years 1996 and 2006 near the back. The sun's 11-year-solar cycle sees an increase in sunspots and solar activity at its peak. The year 2014 is close to the peak year for activity, but the cycle has been more muted than the 2001 cycle. Credit: Steele Hill, SOHO, NASA/ESA — A solar cycle in X-rays. The peak in 2001 is visible at the front, with quietest years 1996 and 2006 near the back. The sun’s 11-year-solar cycle sees an increase in sunspots and solar activity at its peak. The year 2014 is close to the peak year for activity, but the cycle has been more muted than the 2001 cycle. Credit: Steele Hill, SOHO, NASA/ESA

March 31, 2014December 23, 2015 by Elizabeth Howell

Martian Rover Prototype ‘Bryan’ Roves Renovated ‘Mars Yard’ In Europe

A Martian rover prototype nicknamed "Bryan" inside a newly upgraded "Mars Yard" in Stevenage, United Kingdom. The European Space Agency announced the improvements as it works on the ExoMars rover, which is slated to land on the Red Planet in 2018. Credit: Airbus Defence and Space

The five-year-old in me is really excited at picturing rovers in a sandbox. While piloting these machines around simulated Mars terrain has its own inherent joy, it’s also a valuable tool for planners trying to figure out how to get the rovers rolling on the Red Planet.

ExoMars is heading that way in 2018, prompting the European Space Agency and Airbus to renovate a “Mars yard” to test out different design ideas, which they highlighted in an event last week that Universe Today was unable to attend.

The real rover will never see this yard — ESA wants to make sure the machine is pristine for launch — but the simulated terrain will come in handy when controllers want to simulate rover movements on the Red Planet during the mission. Simultaneously, the team showcased a rover prototype called “Bryan.”

A press release for ESA mentioned that the yard had been upgraded, but the agency did not respond to a Universe Today e-mail request asking what those upgrades are or how much they cost. Previous press releases about the facility said that it was eight meters by eight meters (26 feet by 26 feet) in size, while current ones say that the facility is 30 meters by 13 meters (100 feet by 43 feet).

An artist's conception of the European Space Agency's ExoMars rover, scheduled to launch in 2018. Credit: ESA — An artist’s conception of the European Space Agency’s ExoMars rover, scheduled to launch in 2018. Credit: ESA

Also last week, ESA held workshops considering where to land the rover. You can view more information about the selection process at this ESA site, but below are a couple of interesting paragraphs from the site:

“ExoMars 2018 has two science elements. A rover will investigate the local geology and search for signs of past and present life while a surface platform will study the Martian environment. The landing site must be a geologically diverse site that is ancient, and shows the strong potential for once having been habitable,” ESA stated.

“For ancient, read older than 3.6 billion years. Potentially habitable in this context means that there must be abundant evidence that water was once present for extended periods or was frequently recurring at the site. It must also be safe for landing. No safe landing, no science.”

Source: European Space Agency

March 28, 2014December 23, 2015 by Elizabeth Howell

Slip-Sliding Away: Solar Flare’s Magnetic Lines Go For A Loop In This Video

Our own Sun produces flares, but we are protected by our magnetosphere, and by the distance from the Sun to Earth. Credit: NASA/ Solar Dynamics Observatory,

When will the next big solar flare occur? How much damage could it cause to power lines and satellites? These are important questions for those looking to protect our infrastructure, but there’s still a lot we need to figure out concerning space weather.

The video above, however, shows magnetic lines weaving together from the surface of the Sun in 2012, eventually creating an eruption that was 35 times our planet’s size and sending out a surge of energy. It’s these energetic flares that can hit Earth’s atmosphere and cause auroras and power surges.

While models of this have been made before, this is the first time the phenomenon was caught in action. Scientists saw it using NASA’s Solar Dynamics Observatory.

Models of the flares show they typically occur amid distorted magnetic fields, the University of Cambridge noted, showing that the lines can “reconnect while slipping and flipping around each other.” Before the flare happens, the magnetic field lines line up in an arc across the sun’s surface (photosphere). That phenonemon is called field line footprints.

“In a smooth, non-entangled arc the magnetic energy levels are low, but entanglement will occur naturally as the footpoints move about each other,” the release added. “Their movement is caused as they are jostled from below by powerful convection currents rising and falling beneath the photosphere. As the movement continues, the entanglement of field lines causes magnetic energy to build up.”

When the energy gets to great, the lines let go of the energy, creating the solar flare and coronal mass ejection that can send material streaming away from the sun. A note, this observation was made of an X-class flare — the strongest kind of flare — and scientists say they are not sure if this phenomenon is true of all kinds of flares. That said, the phenomenon would be harder to spot in smaller flares.

You can read more about the research in the Astrophysical Journal or in preprint version on Arxiv. It was led by Jaroslav Dudik, a researcher at the University of Cambridge’s center for mathemetical sciences.

Source: University of Cambridge

March 27, 2014December 23, 2015 by Elizabeth Howell

Event Alert: Watch Space Station Hatch Opening Live Tonight

The Expedition 39/40 crew just before climbing into their Soyuz spacecraft in Kazakhstan on March 25, 2014. From top, Oleg Artemyev (Roscosmos), Steve Swanson (NASA) and Alexander Skvortsov (Roscosmos). Credit: NASA/Joel Kowsky

Update, 8:33 p.m. EDT: The Soyuz spacecraft arrived safely at station at 7:53 p.m. EDT (11:53 a.m. UTC) and coverage of the hatch opening is scheduled at 10:15 p.m. EDT (2:15 a.m. UTC).

After spending an extra couple of days in the cramped Russian Soyuz spacecraft, the incoming International Space Station crew will likely be very be glad to get out and stretch their legs. You can check out the festivities live in the video link above.

Three people are set to make a docking with the orbiting complex at 7:58 p.m. EDT (11:58 p.m. UTC). If all goes to schedule, they’ll pop the hatch open at 10:40 p.m. EDT (2:40 a.m. UTC). Meanwhile, engineers are trying to figure out what caused the malfunction that prevented a docking as planned on Tuesday (March 25).

Remember that all schedules are subject to change, so tune into NASA TV well before each event happens.

The Expedition 39/40 crew lifted off Tuesday afternoon (EDT) from Kazakhstan to take a fast track to the space station that should have seen them dock on launch day. The Soyuz has to make three engine firings or burns to accomplish this. The docking was cancelled after the third burn did not happen as planned. The Russian Federal Space Agency (Roscosmos) has determined this was because the spacecraft was in the wrong orientation, but the underlying cause is still being investigated.

Once this happened, the crew switched to a standard backup procedure to bring them to the station in two days instead. (This path, in fact, was what all crews did up until last year.) The crew is safe and in good spirits heading up to the docking, NASA has said. The Soyuz has done several other engine firings since, with no incident.

The Soyuz crew includes Steve Swanson (NASA), Alexander Skvortsov (Roscosmos) and Oleg Artemyev (Roscosmos). Awaiting them on the station are Koichi Wakata (Japan Aerospace Exploration Agency), Rick Mastracchio (NASA) and Mikhail Tyurin (Roscosmos). Wakata is in command of the station, marking a first for Japan’s astronaut corps.

March 27, 2014December 23, 2015 by Elizabeth Howell

Rosetta Spacecraft Spies Its Comet As It Prepares For An August Encounter

The Rosetta spacecraft saw its destination (Comet 67P/Churymov-Gerasimenko) on March 20, 2014 from about three million miles (five million kilometers) away. The comet is in the small circle next to the globular star cluster M107. ESA/MPS for OSIRIS-Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

As Rosetta limbers up for its close-up encounter with a comet, we have visual confirmation that it’s on the right track! The comet spied its destination — Comet 67P/Churymov-Gerasimenko — using its OSIRIS wide-angle camera and narrow-angle camera on March 20 and March 21.

“Finally seeing our target after a 10 year journey through space is an incredible feeling,” stated OSIRIS principal investigator Holger Sierks from the Max Planck Institute for Solar System Research in Germany. “These first images taken from such a huge distance show us that OSIRIS is ready for the upcoming adventure.”

The image comes as Rosetta is preparing its science instruments for its encounter in August.

“Currently, Rosetta is on a trajectory that would, if unchanged, take it past the comet at a distance of approximately 50 000 km and at a relative speed of 800 m/s. A critical series of manoeuvres beginning in May will gradually reduce Rosetta’s velocity relative to the comet to just 1 m/s and bring it to within 100 km by the first week of August,” the European Space Agency stated.

Here’s an animation of how big the comet will appear to Rosetta as it gets closer:

“Between May and August the 4 km-wide comet will gradually ‘grow’ in Rosetta’s field of view from appearing to have a diameter of less than one camera pixel to well over 2000 pixels – equivalent to a resolution of around 2 m per pixel – allowing the first surface features to be resolved.”

For more information on the science commissioning, check out the Rosetta blog.