The Human Footprint on Mars is Expanding…Sometimes Faster Than We’d Like

By Corey S. Powell | November 30, 2016 11:45 pm
The Schiaparelli crash site was observed on November 1 by NASA's Mars Reconnaissance Orbiter. The long arc at the crash site might have been a hydrazine explosion. (Credit: NASA/JPL-Caltech/University of Arizona)

The Schiaparelli crash site was observed on November 1 by NASA’s Mars Reconnaissance Orbiter (MRO). The long arc might have been caused by an explosion of hydrazine propellant. (Credit: NASA/JPL-Caltech/UAz)

It will be a long time until humans put boots on Mars–at least until the 2030s and possibly a lot longer, depending on what the incoming Trump administration thinks about NASA’s unfunded exploration plans. But through our robotic emissaries, we have already made quite a mark on the planet. The newest one, on October 19, was the sad and unexpected splat from the European Space Agency’s Schiaparelli probe. Apparently, betrayed by an errant altitude reading from one of its instruments, the lander crashed into the surface at about 300 kilometers per hour and gouged out 2.4-meter-wide (8-foot) crater surrounded by a debris trail, probably from a fuel explosion.

This was hardly the first time that an attempted Mars touchdown ended the wrong way. Russia’s Mars 3 and Mars 6 landers made it to the surface but failed immediately (a shame, they were very cool designs). NASA’s Mars Polar Lander had a catastrophic crash that prompted an overhaul of the agency’s whole Mars program. The British Beagle 2 probe never phoned home after reaching the surface. They all still sit there on Mars, gathering dust and slowly fading away, along with a whole other set of probes that survived the journey.

Read More

MORE ABOUT: Curiosity, ESA, rover

On TV: A Tale of Two Red Planets

By Corey S. Powell | November 15, 2016 10:14 am
Are we there yet? Astronauts discover that landing on Mars is only the beginning of their journey in the dramatized half of the show. (Credit: National Geographic Channel)

Are we there yet? Astronauts discover that landing on Mars is only the beginning of their journey in the dramatized half of the show. (Credit: National Geographic Channel)

I’ll confess, I came to Mars, the new National Geographic miniseries that debuted last night, with a good dose of skepticism. First of all, it is a half-drama, half-documentary blend, a hybrid mix that often ends up combining the weakest elements of both. Second, there is the matter of timing. The drama part focuses on the intense survival challenges facing the first crew of astronauts to land on Mars. Um, didn’t we just see that in The Martian? The documentary part seems out of step as well, focusing on high-minded ideas about human spaceflight right at a time when the United States is being tossed about by dark political currents.

So I’ll come right to the point: Mars is a success. It paints a portrait of two Red Planets, a distant aspirational target in 2016 and an immediate world to explore and overcome in 2033. It explicitly embraces Elon Musk’s vision of humans as a two-planet species (Musk is a frequent presence in the documentary portions), and it takes a long-horizon view of technological progress that we could really use right now.

Read More

Living and Dying With a Comet

By Corey S. Powell | September 30, 2016 11:42 pm
Comet 67P on April 28, 2015, as it was nearing closest approach to the sun and starting to really cook. (Credit: ESA/Rosetta/NavCam)

Comet 67P on April 28, 2015, as it was nearing closest approach to the sun and starting to really cook. (Credit: ESA/Rosetta/NavCam)

Like many other space enthusiasts around the world, I woke up today in a bittersweet mood as I read the reports about the death of the European Space Agency’s Rosetta comet probe. Its demise was carefully planned and long foretold but was sad all the same, putting a period at the end of a story that rolling out for more than 12 years. During that time, Rosetta made three passes by Earth, one by Mars, visited a pair of asteroids, and spent more than two years scrutinizing Comet 67P/Churyumov–Gerasimenko (typically shorted to “Comet 67P” for obvious reasons). It was the first spacecraft to orbit a comet. It also deployed the first-ever comet lander, Philae.

Now all that is over. No way around it, the end of a great adventure is bitter.

The sweet part is the extraordinary science Rosetta has conducted along the way. Early results confirmed the presence of diverse organic compounds; showed that comets alone could not have provided the water that fills Earth’s oceans; mapped the surprisingly complex magnetic environment around Comet 67P; and catalogued enormous eruptions of gas and dust–roughly 100,000 kilos [200,000 pounds] at a time–that show how comets disintegrate under the force of solar heat. Much of Rosetta’s dataset has yet to be fully analyzed. Planetary scientists will be mining new insights from it for many years to come.

Read More

MORE ABOUT: ESA, Philae, Rosetta

The Race to Proxima Centauri (Part 1)

By Corey S. Powell | August 31, 2016 11:52 pm
An invisible planet beside the tiny dot of Proxima Centauri may be the key to understanding Earthlike planets across our galaxy. (Credit: Digitized Sky Survey 2)

An invisible planet orbiting the pale red dot of Proxima Centauri (seen here alongside its much brighter neighbors, Alpha Centauri A & B) may be the key to understanding Earthlike planets across our galaxy. (Credit: Digitized Sky Survey 2)

Sometimes it takes a while for the meaning of a new scientific discovery to really sink in. In the case of the planet Proxima Centauri b, announced last week, it may take decades or even centuries to fully grasp the importance of what we have found. You see, this is not just any planet: It is similar to Earth in mass, and it orbits its star in the “habitable zone,” where temperatures could potentially allow the existence of Earthlike bodies of liquid water. Proxima Centauri is not just any star, either: It is the very nearest one after the Sun, and it is a small red orb whose feeble light makes it relatively easy to study the planet close beside it.

The science at stake here is enormous. Proxima Centauri b will surely become the archetype for understanding more distant Earth-size, and possibly Earth-like, planets all across our galaxy. The effort needed to study it will be enormous, too, however. At present the planet cannot even be glimpsed directly through the mightiest telescopes on Earth. Nevertheless, the race is on–a thrilling but maddeningly slow-motion race to bring Proxima Centauri into view, to figure out if it could (or does!) support life, even to visit it with an interstellar probe.

Read More

How Astronomers Plan to Solve the Mystery of the “Alien Megastructure Star”

By Corey S. Powell | July 31, 2016 11:10 pm
In the constellation Cygnus, one faint star displays enigmatic changes in brightness. Something huge is passing in front of the star–but what? (Credit: Stellaruim, Boyajian et al)

In the constellation Cygnus, the faint star formally known as KIC 8462852 displays irregular, enigmatic changes in brightness. Something huge is passing in front of the star and blocking its light–but what? (Credit: Stellaruim, Boyajian et al)

If you look in enough places, eventually you’ll find something profoundly strange. That’s been a reliable rule of thumb through the history of science, and last year it proved dramatically true again for astronomer Tabetha Boyajian. While digging through data from NASA’s Kepler space telescope, which has been monitoring 150,000 stars for signs of orbiting planets, she realized that one of these things is not like the others. A single star in that set, formally catalogued as KIC 8462852 but informally known as Tabby’s Star, flickers in an inexplicable way: unlike the shadows produced by planets, unlike any known type of stellar pulsation, simply unlike anything seen before.

Tabby’s Star is so unusual that a few scientists, including Boyajian’s colleague Jason Wright, raised the possibility that its flickering is not natural but is due to the presence of an enormous artificial construct. That speculation quickly lent KIC 8462852 another nickname, the “alien megastructure star,” and prompted a flood of breathless news stories; it even got a shout out on Saturday Night Live. Boyajian’s subsequent TED lecture drew even more attention to her star. [Update: A week after I posted this interview, Tabby’s Star star got weirder still: A new study shows that it has been inexplicably getting dimmer over the past three years.]

Read More

Getting Under the Alien Skin of the New ‘Independence Day’

By Corey S. Powell | June 24, 2016 4:01 pm
Aliens arrive with everything cranked to 11 in Independence Day: Resurgence. (Credit: Twentieth Century Fox Film Corporation)

The aliens are back and everything is cranked up to 11 in Independence Day: Resurgence, a 20-years-later sequel. (Credit: Twentieth Century Fox Film Corporation)

If you are looking for cerebral science fiction stories that meticulously explore the outer limits of known science, Roland Emmerich is not your guy. The auteur behind the 1996 alien-invasion movie Independence Day and its new sequel, Independence Day: Resurgence, is all about spectacle over subtlety. (2012 and The Day After Tomorrow are also his handiwork.) Blowing up cities? Check. Sciencing the sh*t out of things? Not so much.

Taken on its own terms, though, the first Independence Day was a lot of fun and—beneath the popcorn-chewing action—smarter than it looked. Emmerich’s best idea was not trying to give his aliens convoluted, ludicrous motivations. Instead he envisioned them as a rapacious swarm, roaming instinctively from planet to planet in search of resources. The sequel maintains that premise and supersizes it, in the inevitable Hollywood style.

Read More

The Billionaire and the Doomsday Dust-up

By Corey S. Powell | May 31, 2016 11:52 pm
Map of "potentially hazardous objects" shows 1,400 such bodies that come unsettlingly close to our planet. (Credit: NASA/JPL-Caltech)

Map of “potentially hazardous objects” shows 1,400 such bodies that come unsettlingly close to our planet. (Credit: NASA/JPL-Caltech)

First of all, let me reassure you that this post has nothing at all to do with Donald Trump. The billionaire in question is not the presidential candidate but Nathan Myhrvold, the former chief technology officer at Microsoft. The doomsday I’m talking about is not political but physical. And the dust-up comes down to a contentious but ultimately quantifiable issue: What is the real risk from asteroid impacts?

In a recent paper, Myhrvold charges that NASA scientists have made some serious errors in calculating the size and properties of the asteroids that come dangerously close to our planet. The specific details are fairly technical (you can read a semi-popular summary of his argument here in PDF form), but the upshot is plain enough. If the estimated asteroid sizes are wrong, so are the associated dangers posed by these objects. That would raise a whole new level of uncertainty around a type of natural disaster that is already the subject of highly polarized hype and dismissals.

Read More

To Planet 9 and Beyond: An Interview with Mike Brown

By Corey S. Powell | April 30, 2016 11:53 pm
A man and his planet: Mike Brown alongside the most likely orbit of Planet 9. (Credit: Caltech)

A man and his planet: Mike Brown alongside the most likely orbit of Planet 9. (Credit: Caltech)

I mean no disrespect when I say that Mike Brown is a man on the edge. In fact, it is one of the highest forms of praise I can imagine. Brown, an astronomer at Caltech, has been one of the most aggressive scientific explorers of the dark, outer boundaries of the solar system. His campaign to extend human vision into the poorly understood region beyond Neptune led to the discovery of a whole menagerie of large object including Pluto’s near-twin, Eris. That work led to the official demotion of Pluto from planet to “dwarf planet.”

Brown has no regrets (he proudly calls himself @plutokiller on Twitter), not because he considers Pluto unimportant but because he considers the whole vast region beyond Neptune so hugely important for understanding the evolutionary history of Earth and the rest of the solar system. Most recently, Brown and his colleague Konstantin Batygin tracked down strong evidence for Planet 9, a large planet–about 10 times the mass of Earth–orbiting at least 200 times as far from the sun as we are. The announcement made headlines around the world. But Planet 9 is still just a beginning.

Read More

MORE ABOUT: Nibiru, Planet 9, Pluto

The Solar System is a-Changing

By Corey S. Powell | March 31, 2016 11:14 pm
Three of the five big impacts (that we know of!) on Jupiter over the past 22 years. Comet Shoemaker-Levy 9 left a series of huge blemishes (left), but the less celebrated 2009 strike left scars of its own (middle). Two weeks ago, Gerrit Kernbauer of Austria caught another impact in the act (right). Credit: ESA/NASA/STScI; Anthony Wesley; Gerrit Kernbauer.

Three of the five impacts observed on Jupiter over the past 22 years: Comet Shoemaker-Levy 9 left a series of huge blemishes (left). The less celebrated 2009 strike created scars of its own (middle). Two weeks ago, Gerrit Kernbauer of Austria caught an impact in the act (right). Credit: ESA/NASA/STScI; Anthony Wesley; Gerrit Kernbauer.

When I was a kid and got hooked on astronomy (sometime around age 7), one of the things I deeply enjoyed about the night sky was its constancy. The human world is full of unwanted variables: Families move, friends get into fights with you, bicycles crash, birthday parties don’t turn out the way you wanted…but all you have to do is look up and you can make contact with another realm that never produces such disappointments. The stars are always in the same places. The planets slide around in the sky, but they don’t really change. Every time you see Jupiter, it is the same old reliable Jupiter.

Except that it isn’t. The closer you look at the solar system, the more you see change happening, and on all time scales. The constancy was an illusion, created by humans (not just my younger self!) watching the sky too erratically and too impatiently to see what is really going on. Jupiter is not always the same old Jupiter, as is abundantly clear from amateur video showing the planet getting whacked by a small asteroid or comet on the night of March 17. Watch other worlds and you’ll see the same thing happening. Wait longer–quite long by human standards, but very short in astronomical terms–and some really weird, extreme events unfold.

Read More

Hunting Ghosts Across the Cosmos

By Corey S. Powell | February 29, 2016 11:56 pm
Credit: LIGO, NSF, Aurore Simonnet (SSU).

What we see versus what we believe: The bottom signal represents the vibration signal at the two LIGO gravitational wave facilities. The illustration above indicates the astrophysical interpretation of the signal–two black holes merging into one. It has taken a century to come up with the concept and technology to track down invisible gravitational waves (Credit: LIGO, NSF, Aurore Simonnet)

The recent discovery of gravitational waves by the twin LIGO detectors drove home the gaping chasm between the popular image of how astronomers explore the cosmos and the way it actually happens. In the layperson’s view — which, to be fair, aligns well with daily experience of how we find out new things — exploration is a matter of looking, seeing, and understanding. In reality, most of what astronomers do involves looking without seeing, or seeing without understanding. It involves not just working at the edge of perception, but trying to deduce what lies beyond perception.

At the risk of sounding unscientific, I’d call it cosmic ghost hunting.

Read More

NEW ON DISCOVER
OPEN
CITIZEN SCIENCE
ADVERTISEMENT

Out There

Notes from the far edge of space, astronomy, and physics.
ADVERTISEMENT

See More

ADVERTISEMENT

Discover's Newsletter

Sign up to get the latest science news delivered weekly right to your inbox!

Collapse bottom bar
+