Jason Major, Author at Universe Today

February 6, 2013December 23, 2015 by Jason Major

Earthlike Exoplanets Are All Around Us

Artist's impression of a Jupiter-sized exoplanet orbiting an M-dwarf star

Artist’s impression of a rocky planet orbiting a red dwarf. Credit: David A. Aguilar (CfA)

We may literally be surrounded by potentially habitable exoplanets, according to new research by a team from the Harvard-Smithsonian Center for Astrophysics.

Using data gathered by NASA’s exoplanet-hunting Kepler spacecraft, the CfA researchers discovered that many red dwarf stars harbor planets, and some of those planets are rocky, Earth-sized worlds. Considering that red dwarfs, albeit optically dim, are the most abundant type of stars in our galaxy, this means that even a small percentage of them being host to Earthlike exoplanets puts the total number of potentially habitable worlds very high — and some of them could be right next door.

“We thought we would have to search vast distances to find an Earth-like planet,” said CfA astronomer and the paper’s lead author Courtney Dressing. “Now we realize another Earth is probably in our own backyard, waiting to be spotted.”

And our own backyard, in cosmic terms, could mean a mere 13 light-years away.

Our solar system is surrounded by red dwarfs. You can’t see them in the night sky because they are much too dim — less than a thousandth the brightness of the Sun. But they make up 75% of the stars in the local neighborhood, and based on the Kepler data the CfA team estimates that 6% of those red dwarfs likely have an Earth-sized planet in orbit around them.

And with at least 75 billion red dwarfs scattered across the galaxy… well, you do the math.*

“We now know the rate of occurrence of habitable planets around the most common stars in our galaxy,” said co-author David Charbonneau (CfA). “That rate implies that it will be significantly easier to search for life beyond the solar system than we previously thought.”

A visualization of the “unseen” red dwarfs in the night sky. Credit: D. Aguilar & C. Pulliam (CfA) See original here.

The conditions on a planet orbiting a red dwarf wouldn’t be exactly like Earth, of course. The planet would have to orbit rather closely to its star to be within its habitable zone, and would have to have a reasonably thick atmosphere to regulate heat and protect it from stellar outbursts. But one benefit to orbiting a red dwarf is that they have very long life spans — potentially longer than the current age of the Universe! So a habitable world around a red dwarf would literally have billions of years for life to evolve, thrive and develop on it.

“We might find an Earth that’s 10 billion years old,” Charbonneau said.

The team’s findings were presented today, Feb. 6, by Dressing during a press conference at the Harvard-Smithsonian Center for Astrophysics in Cambridge, MA. The results will be published in The Astrophysical Journal. (Added 2/7/13: here’s the video of the press conference.)

CfA astronomers identified 95 planetary candidates circling red dwarf stars. Of those, three orbit within the habitable zone (marked in green) – the distance at which they should be warm enough to host liquid water on the surface. Those three planetary candidates (marked with blue dots) are 0.9, 1.4, and 1.7 times the size of Earth. Credit: C. Dressing (CfA)

Another Amazing Earth View: The Andes Under a Blue Pacific Fog

View of the Andes from the ISS on Feb. 4, 2013 (NASA)

Even though he’s a busy guy, Expedition 34 astronaut Chris Hadfield still takes the time to share some of his amazing views from orbit aboard the ISS. One of his most recent photos is this stunning view of Andean ridges rising up from a blue haze ~~of Pacific fog~~, the arc of Earth’s horizon in the distance. Gorgeous! (Edit: according to a labeled image by Peter Caltner, this is looking southeast into northern Argentina – no Pacific in view. So the haze is coming from the valley, not the ocean.)

Shared on Twitter at 6:25 p.m. EST, this has quickly become one of Hadfield’s more popular images — and for good reason. In fact sometimes it’s hard to keep up with this high-flying Canadian, who easily posts half a dozen or more photos from all across the world every day on Twitter, Facebook, and his Google+ profile (which is managed by his son Evan.) But since the ISS goes around the globe 16 times a day, there’s certainly no shortage of sights for Chris and the Exp. 34 crew!

Check out a few more of Chris Hadfield’s recent photos below:

The Mississippi delta deposits “the soil of America’s heartland” into the Gulf of Mexico (NASA)

“It’s a bird, it’s a plane… it’s a river in South America!” tweeted Hadfield. (Actually it’s looking west along the Rio São Francisco river in Brazil.) NASA

Chesapeake Bay from orbit. “You can even see the causeway,” Hadfield noted. (NASA)

On Feb. 2, Hadfield took this photo of storm clouds over Africa. “My breath was taken away,” he wrote. (NASA)

Toronto on the shore of Lake Ontario, “Canada’s most populous city” (NASA)

Want to see more of Chris Hadfield’s images from orbit? Follow him on Twitter and Facebook and over on Google+. (Just don’t be surprised if you find yourself changing your desktop background a lot more often!)

And for even more space adventures, tune in to the CSA website on February 7 at 10:30 a.m. EST when Col. Hadfield will have a live chat with William Shatner, building upon their brief (but immensely popular) impromptu web conversation from last month. He’ll also be taking questions from “space tweeps” on-site at CSA.

February 4, 2013April 26, 2016 by Jason Major

Is This Meteorite a Piece of Mercury?

The largest fragment of meteorite NWA 7325 (Photo © Stefan Ralew / sr-meteorites.de)

Pieces of the Moon and Mars have been found on Earth before, as well as chunks of Vesta and other asteroids, but what about the innermost planet, Mercury? That’s where some researchers think this greenish meteorite may have originated, based on its curious composition and the most recent data from NASA’s MESSENGER spacecraft.

NWA 7325 is the name for a meteorite fall that was spotted in southern Morocco in 2012, comprising 35 fragments totaling about 345 grams. The dark green stones were purchased by meteorite dealer Stefan Ralew (who operates the retail site SR Meteorites) who immediately made note of their deep colors and lustrous, glassy exteriors.

Ralew sent samples of NWA 7325 to researcher Anthony Irving of the University of Washington, a specialist in meteorites of planetary origin. Irving found that the fragments contained surprisingly little iron but considerable amounts of magnesium, aluminum, and calcium silicates — in line with what’s been observed by MESSENGER in the surface crust of Mercury.

And even though the ratio of calcium silicates is higher than what’s found on Mercury today, Irving speculates that the fragments of NWA 7325 could have come from a deeper part of Mercury’s crust, excavated by a powerful impact event and launched into space, eventually finding their way to Earth.

In addition, exposure to solar radiation for an unknown period of time and shock from its formation could have altered the meteorite’s composition somewhat, making it not exactly match up with measurements from MESSENGER. If this is indeed a piece of our Solar System’s innermost planet, it will be the first Mercury meteorite ever confirmed.

But the only way to know for sure, according to Irving’s team’s paper, is further studies on the fragments and, ultimately, sample returns from Mercury.

Irving’s team’s findings on NWA 7325 will be presented at the 44th Lunar and Planetary Science Conference to be held in Houston, TX, on March 18-22. Read more in this Sky & Telescope article by Kelly Beatty.

Inset image: impact craters located within Mercury’s Caloris Basin (NASA/JHUAPL)

February 3, 2013December 23, 2015 by Jason Major

We Are Made of Stardust

This brief quote by the late Carl Sagan is wonderfully illustrated in the beautiful and poignant short film “Stardust,” directed by Mischa Rozema of Amsterdam-based media company PostPanic. Using actual images from space exploration as well as CGI modeling, Stardust reminds us that everything we and the world around us are made of was created inside stars… and that, one day, our home star will once again free all that “stuff” back out into the Universe.

The film was made in memory of talented Dutch designer Arjan Groot, who died of cancer in July 2011 at the age of 39.

“I wanted to show the universe as a beautiful but also destructive place. It’s somewhere we all have to find our place within. As a director, making Stardust was a very personal experience but it’s not intended to be a personal film and I would want people to attach their own meanings to the film so that they can also find comfort based on their own histories and lives.”
– Mischa Rozema, director

A truly stunning tribute.

See more about this on PostPanic’s Vimeo page. (Credits after the jump.)

Credits:
A PostPanic Production
Written & directed by Mischa Rozema
Produced by Jules Tervoort
VFX Supervisor: Ivor Goldberg
Associate VFX Supervisor: Chris Staves
Senior digital artists: Matthijs Joor, Jeroen Aerts
Digital artists: Marti Pujol, Silke Finger, Mariusz Kolodziejczak, Dieuwer Feldbrugge, Cara To, Jurriën Boogert
Camera & edit: Mischa Rozema
Production: Ania Markham, Annejes van Liempd
Audio by Pivot Audio , Guy Amitai
Featuring “Helio” by Ruben Samama
Copyright 2013 Post Panic BV, All rights reserved

In the grand scheme of the universe, nothing is ever wasted and it finds comfort in us all essentially being Stardust ourselves. Voyager represents the memories of our loved ones and lives that will never disappear.

February 2, 2013April 26, 2016 by Jason Major

There’s Poop on the Moon

When the Apollo boys visited the Moon back in the ’60s and ’70s they left more than just some experiments, rovers, and family portraits behind –- they also left, shall we say, a little bit of themselves on the lunar surface. It makes total sense when you think about it, but still… there’s poop on the Moon.

In this video, Minute Physics and Destin from Smarter Every Day show how astronauts would relieve themselves during the Apollo missions (or at least the gadgets they used — we all know how they did it) and why it was decided to make astronaut poop a permanent part of their lunar litter.

(Because there’s no public toilets in the Sea of Tranquility.)

In another video Destin goes on to discuss some of the other things the Apollo astronauts left on the lunar surface as part of their… duties… most notably the Laser Ranging Retroreflectors that are still being used today to measure distances between Earth and the Moon. Destin explains how their corner-cube reflectors work — using, fittingly, the mirrors in a restroom shared with NASA at the University of Alabama at Huntsville. Check out the video below.

According to the Lunar and Planetary Institute: “The Laser Ranging Retroreflector experiment has produced many important measurements. These include an improved knowledge of the Moon’s orbit and the rate at which the Moon is receding from Earth (currently 3.8 centimeters per year) and of variations in the rotation of the Moon. These variations in rotation are related to the distribution of mass inside the Moon and imply the existence of a small core, with a radius of less than 350 kilometers, somewhat smaller than the limits imposed by the passive seismic and magnetometer experiments. These measurements have also improved our knowledge of changes of the Earth’s rotation rate and the precession of its spin axis and have been used to test Einstein’s theory of relativity.”

Want to see how corner-cube reflectors work? Click here.

The Laser Ranging Retroreflector experiment deployed on Apollo 11 (NASA)

Just goes to show that not everything that got left behind was crap.

See more videos from Destin at Smarter Every Day here and more Minute Physics here.

February 1, 2013December 23, 2015 by Jason Major

From One Laurel to Another: a Letter from Columbia

STS-107 Mission Specialist Laurel B. Clark (NASA)

On this Day of Remembrance, February 1, 2013, NASA will mark the 10th anniversary of the STS-107 Columbia accident with a wreath-laying ceremony at the astronaut memorial in Arlington National Cemetery, paying tribute to the lost crews of Columbia, Challenger and Apollo 1, as well as other space explorers and NASA colleagues who have passed on. Most of us have our own personal memories of the tragic events that took the lives of these brave few who risked everything in the name of exploration, knowledge, and discovery, and I’ve agreed to share one person’s connection to the Columbia crew.

Laurel Nendza, a fellow space blogger over on that social media site that begins with F and rhymes with “acebook” has a particular connection with STS-107 Mission Specialist Laurel B. Clark… if only that they both love space and share the same first name. Still, it’s enough to hang one’s heart on, and Laurel (the blogger) recently posted a particularly touching note that was sent by Laurel (the astronaut) to her family just before Columbia headed back on its ill-fated return trip home. Here’s Laurel’s (and Laurel’s) story:

On February 1, 2003, the seven [STS-107] crew members were lost with the Space Shuttle Columbia over North Texas during the shuttle’s re-entry. They were brave men and women who gave their lives for space exploration.

One member has always stood out to me. Her name was Laurel Clark. She would probably agree that growing up there were never any other Laurels around. She may at one time hated her name like I did, only to realize she was actually cool and unique because she was the only one around with that name. But Laurel is not just a name, it’s a personality trait. I know a handful of Laurels (mostly from Facebook) and we all seem to have the same things in common. Most of us always have had deep compassion for animals, the Earth, and the sky above us. Laurel Clark was no different.

What was different about Laurel Clark is that she was just a handful of people on Earth, EVER, who actually achieved what we all dream. She was an astronaut and got to go to outer space. She had the privilege (that she worked very hard to get) to witness our pale blue dot from above as well as breathtaking auroras, lightning, and the Sun and Moon rising.

Before she departed to her last shuttle flight home she sent an email to her family and close friends. She told them of every incredible, awe-inspiring moment she had been a part of. She and the other 6 members who perished in the Columbia tragedy are true heroes and inspirations to all who came after her. They are my inspiration. My dream is to also be able to see my beautiful planet from above, and to see the stars shine bright in all their glory.

She was the first Laurel in space, who knows? Maybe one day I will be the next?

Rest in peace all the brave crew of the Shuttle Columbia.

Below is Laurel Clark’s last message to her loved ones on Earth:

“Hello from above our magnificent planet Earth. The perspective is truly awe-inspiring. This is a terrific mission and we are very busy doing science round the clock. Just getting a moment to type e-mail is precious so this will be short, and distributed to many who I know and love.

I have seen some incredible sights: lightning spreading over the Pacific, the Aurora Australis lighting up the entire visible horizon with the cityglow of Australia below, the crescent moon setting over the limb of the Earth, the vast plains of Africa and the dunes on Cape Horn, rivers breaking through tall mountain passes, the scars of humanity, the continuous line of life extending from North America, through Central America and into South America, a crescent moon setting over the limb of our blue planet. Mount Fuji looks life a small bump from up here, but it does stand out as a very distinct landmark.

Magically, the very first day we flew over Lake Michigan and I saw Wind Point (Wisconsin) clearly. Haven’t been so lucky since. Every orbit we go over a slightly different part of the Earth. Of course, much of the time I’m working back in Spacehab and don’t see any of it. Whenever I do get to look out, it is glorious. Even the stars have a special brightness.

I have seen my ‘friend’ Orion several times. Taking photos of the earth is a real challenge, but a steep learning curve. I think I have finally gotten some beautiful shots the last 2 days. Keeping my fingers crossed that they’re in sharp focus.

My near vision has gotten a little worse up here so you may have seen pics/video of me wearing glasses. I feel blessed to be here representing our country and carrying out the research of scientists around the world. All of the experiments have accomplished most of their goals despite the inevitable hiccups that occur when such a complicated undertaking is undertaken. Some experiments have even done extra science. A few are finished and one is just getting started today.

Astronaut Laurel B. Clark, STS-107 mission specialist, conducting a check of the YSTRES experiment in the Biopack incubator. Astronaut Rick D. Husband, mission commander, holds a vacuum cleaner to perform general housekeeping duties on the middeck of the Space Shuttle Columbia. (NASA)

The food is great and I am feeling very comfortable in this new, totally different environment. It still takes a while to eat as gravity doesn’t help pull food down your oesophagus. It is also a constant challenge to stay adequately hydrated. Since our body fluids are shifted toward our heads our sense of thirst is almost non-existent.

Thanks to many of you who have supported me and my adventures throughout the years. This was definitely one to beat all. I hope you could feel the positive energy that beamed to the whole planet as we glided over our shared planet.

Love to all, Laurel.”

You can find out more about Laurel Clark and the other STS-107 crew members on the NASA History site here.

The STS-107 crew, waving to onlookers, exited the Operations and Checkout Building on their way to Launch Pad 39A for liftoff on Jan. 16, 2003. Leading the way were Pilot William “Willie” McCool (left) and Commander Rick Husband (right). Following in the second row are Mission Specialists Kalpana Chawla (left) and Laurel Clark; in the rear are Payload Specialist Ilan Ramon, Payload Commander Michael Anderson and Mission Specialist David Brown. All seven perished during re-entry breakup two weeks later on Feb. 1, 2003. (NASA)

See more of Laurel Nendza’s posts on her Facebook page, Stellar Eyes.

At 10 a.m. EST on Feb. 1, NASA TV will provide live coverage of a wreath-laying ceremony at the Space Mirror Memorial located in the Kennedy Space Center Visitor Complex in Florida. Flags across the agency will be flown at half-staff memory of the Columbia crew and all who have lost their lives in dedication of space exploration.

January 31, 2013April 26, 2016 by Jason Major

First Color Image of Curiosity’s Tracks from Orbit

HiRISE image of Curiosity’s tracks, landing zone and the MSL rover at John Klein outcrop (NASA/JPL/University of Arizona)

As Curiosity prepares for the historic first drilling operation on Mars, the HiRISE camera aboard the Mars Reconnaissance Orbiter captured an image of it from 271 km (169 miles) up, along with twin lines of tracks and the blast marks from the dramatic rocket-powered descent back on August 6 (UTC).

The image here was acquired on Jan. 13, Sol 157 of the MSL mission, as part of a dual HiRISE/CRISM observation of the landing site. According to The University of Arizona’s HiRISE site it’s the first time the rover’s tracks have been imaged in color.

Her original landing site can be seen at the right edge. (Wait… did I just say “her?”)

The pair of bright white spots in the HiRISE image show the area immediately below where sky crane’s rockets were pointed. Those areas were “blasted clean” and therefore show brightest. The larger dark scour zone is dark because the fine dust has been blown away from the area leaving darker materials.

– Ross A. Beyer, UofA HiRISE team

Curiosity can be seen as she (yes, it was confirmed today during ScienceOnline2013 that the rover — like all exploration vehicles — is a girl) was preparing for drilling into a rock outcrop called John Klein within the “Yellowknife” region in Gale Crater. Drilling is expected to begin today, Jan. 31.

Orbital view (detail) of Curiosity at her drilling site in Yellowknife. Image was rotated so north is up. (NASA/JPL/University of Arizona)

Read more about the first drilling to be performed on Mars in this article by Ken Kremer, and see more news from the MSL mission here.

January 30, 2013April 26, 2016 by Jason Major

The Cost of Exploring Space: Film vs. Reality

We all know that space exploration, while certainly not the largest expenditure of most countries, doesn’t come cheap. But neither do big-budget science fiction films, either. Special effects, sets, special effects, popular acting talent… special effects… those all come with hefty price tags that make sci-fi and fantasy films costly ventures — although bigger definitely isn’t always better. If you were to compare the price of real space exploration missions (which provide actual information) to the costs of movies about space exploration (which provide “only” entertainment) what would you expect to find?

This infographic does just that:

“Prometheus’ movie budget would be enough to keep the search for real aliens going for another 52 years.”

Wow. (Maybe they should have just written a check to SETI.)

January 30, 2013December 23, 2015 by Jason Major

Lighting Up Andromeda’s Coldest Rings

Cold rings of dust are illuminated in this image taken by Herschel’s Spectral and Photometric Imaging Receiver (SPIRE) instrument. Credit: ESA/NASA/JPL-Caltech/B. Schulz (NHSC)

Looking wispy and delicate from 2.5 million light-years away, cold rings of dust are seen swirling around the Andromeda galaxy in this new image from the Herschel Space Observatory, giving us yet another fascinating view of our galaxy’s largest neighbor.

The colors in the image correspond to increasingly warmer temperatures and concentrations of dust — blue rings are warmer, while pinks and reds are colder lanes of dust only slightly above absolute zero. Dark at shorter wavelengths, these dust rings are revealed by Herschel’s amazing sensitivity to the coldest regions of the Universe.

The image above shows data only from Herschel’s SPIRE (Spectral and Photometric Imaging Receiver) instrument; below is a mosaic made from SPIRE as well as the Photodetecting Array Camera and Spectrometer (PACS) instrument:

“Cool Andromeda” Credit: ESA/Herschel/PACS & SPIRE Consortium, O. Krause, HSC, H. Linz

Estimated to be 200,000 light-years across — almost double the width of the Milky Way — Andromeda (M31) is home to nearly a trillion stars, compared to the 200–400 billion that are in our galaxy. And within these cold, dark rings of dust even more stars are being born… Andromeda’s star-making days are far from over.

Herschel’s mission will soon be coming to an end as the telescope runs out of the liquid helium coolant required to keep its temperatures low enough to detect such distant heat signatures. This is expected to occur sometime in February or March.

Herschel is a European Space Agency cornerstone mission with science instruments provided by consortia of European institutes, and with important participation by NASA. Launched May 14, 2009, the telescope orbits the second Lagrange point of the Earth-Sun system (L2), located 1.5 million km (932,000 miles) from Earth. Read more from the Herschel mission here.

January 30, 2013December 23, 2015 by Jason Major

In Two Weeks This 50-Meter Asteroid Will Buzz Our Planet

Asteroid 2012-DA14 will pass Earth closely on Feb. 15, 2013 (NASA)

On February 15 a chunk of rock about 50 meters wide will whiz by Earth at nearly 8 km/s, coming within 27,680 km of our planet’s surface — closer than many weather and communications satellites.

For those of you more comfortable with imperial units, that’s 165 feet wide traveling 17,800 mph coming within 17,200 miles. But regardless whether you prefer meters or miles, in astronomy that’s what’s called a close call.

Scientists stress that there’s no danger of an impact by this incoming asteroid, designated 2012-DA14, but it’s yet another reminder that in our neck of the Solar System we are definitely not alone.

“2012-DA14 will definitely not hit Earth,” says JPL’s near-Earth object specialist Don Yeomans. “The orbit of the asteroid is known well enough to rule out an impact.”

But with 2012-DA14’s upcoming February flyby Yeomans notes, “this is a record-setting close approach.”

The rocky asteroid will come within about 4 Earth radii, which is well within the orbits of geosynchronous satellites. During its closest approach at 19:26 UTC it should be visible in the sky to amateur telescopes (but not the naked eye), becoming as bright as an 7th- or 8th-magnitude star.

Radar observatories will be watching 2012-DA14 during the days leading up to and following its approach in an attempt to better determine its size, shape and trajectory. NASA’s Goldstone facility will have an eye — er, dish — on DA14, but it won’t be visible to Arecibo. Stay tuned for more info!

Read more about 2012-DA14 on the JPL Near-Earth Object Program page here.