Outer Space

Part of the comet's smaller lobe from about 8 km above the surface

Rosetta’s Comet Close-Ups Reveal Goosebumps And Very Little Ice

Rosetta is watching for changes as the double-lobed comet approaches the sun

A multihued aurora ripples across the night sky over Tromsø, Norway, on January 19. Auroras happen when high-energy particles from the sun slam into Earth's atmosphere, exciting gas molecules in the air and causing them to emit light. The colors seen depend on the type of molecules involved and the altitude at which the most interactions are happening. Green is the most common shade for auroras and is produced by oxygen molecules at relatively low altitudes—between 62 and 186 miles.

These Celestial Highlights Include Flowing Auroras and a Cracked Comet

Catch up on the week's best space images, from a cyclone's glowing eye to a surreal Martian vista

Artwork depicts the European Space Agency's Mars Express spacecraft, which was launched from Earth in June, 2003 carrying the Beagle2 lander. Mars Express continues to function even today.

Found: One Missing Mars Probe, Still Intact

High-res images of Mars' surface identify a long-missing probe and suggests that bad luck—rather than human error—caused the loss

Ten years ago this week, the Huygens probe gave scientists a first look at the icy surface beneath the haze of Saturn's moon Titan.

Best Space Photos of the Week: From Solar Flares to Saturn's Moons

A spitting sun, a well-loved lake and a happy accident on Mars star in this week's best space images

Two New Studies Posit At Least Two New Planets Out Beyond Pluto

We may not be done learning about our own solar system

Space Fence, a radar system sponsored by the U.S. Air Force and built by Lockheed Martin, should help the U.S. detect and track more of the estimated 500,000 pieces of space debris.

U.S. Air Force Builds New Radar for Space Junk

It’s called Space Fence and should help us track the estimated 500,000 pieces of debris that orbit Earth

Hubble snapped this incredibly detailed view of the "Pillars of Creation" to help mark its 25th anniversary.

Top Space Pictures of the Week, From a Hubble Icon to Hungry Black Holes

Ghostly pillars, a dark nebula and a galaxy herd starred in some of the best image-driven stories released at a recent astronomy meeting

Dale A. Gardner, Space Shuttle Mission 51-A, George D. Guzzi Jr. This watercolor shows Dale Gardner tethered to the exterior of Space Shuttle Discovery. During that mission, Gardner and Joseph Allen donned jet-propelled maneuvering units on spacewalks to recover two malfunctioning satellites.

Space Exploration Would Be Nothing If We Didn't Know How to Spacewalk

The Air and Space Museum brings the privileged experience to the public in an exhibit that chronicles 50 years of technology

An artist's rendition of Kepler, on the hunt for planets like our own.

Visit Kepler's Exoplanets—And Don't Worry About the Natives (At Least for Now)

NASA has made a set of travel posters themed to exoplanets while a nonprofit searches for life among them

This artist's depiction shows a gas giant planet akin to Jupiter rising over an alien ocean.

New Super-Earths Double the Number of Life-Friendly Worlds

Three studies looking at small, rocky planets are helping astronomers figure out how common worlds like ours are in the galaxy

This image, created by a telescope called NuSTAR, is the most detailed of the sun using high-energy rays to date, according to NASA.

NASA Uses X-Rays to Find Out Why the Sun Is So Hot

The image will help scientists decide whether mini-flares make the sun's atmosphere hotter than the surface itself

A composite image made in Payson, Arizona, on December 28 shows Comet Lovejoy as it seemed to pass a globular cluster of stars called Messier 79.

How to See This Green Comet With the Naked Eye

The "New Year's Comet" is taking astronomers by storm with an unexpected showing, and it should only get brighter through early January

Our Answers to the Most Burning Questions of 2014

Here are the ten most popular installments of "Ask Smithsonian" this year

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Scientifically Accurate 'Twinkle Twinkle Little Star' Is Still Charming

Stars aren't diamonds at all—they're giant balls of gas

One of the line items in the new budget is funding for a mission to Jupiter's moon Europa.

NASA Could Actually Get a Budget Boost Next Year

The pending budget will give NASA even more money than they asked for

Enthusiasts examining the patch for NROL-35 think the trident, fire and breeze through the character’s hair might represent the elements—water, fire and wind. “What that has to do with the actual payload, however, is anyone’s guess,” says space historian Robert Pearlman.

The Creepy, Kitschy and Geeky Patches of US Spy Satellite Launches

There may be method to the madness behind the outlandish designs of the National Reconnaissance Office mission patches

The Orion capsule idles on the pad atop a Delta IV Heavy rocket just minutes after the launch was canceled.

A Wayward Boat And Other Disruptions Delay Test of NASA's Newest Spaceship

Orion's quest for space will have to wait until tomorrow

A still under construction Orion space capsule at the Michoud Assembly Facility in 2012.

Welcome to the Next Era of NASA Spaceflight...to Mars

NASA's long-distance crew capsule, Orion, will get its first test flight tomorrow

The quantum realm can seem to defy common sense.

Five Practical Uses for "Spooky" Quantum Mechanics

Fifty years after Bell's Theorem, tools that harness the weird properties of quantum mechanics are at work all around you

You can't spend your way out of this one, America

NASA Is Turning Black Friday Into "Black Hole Friday"

Because, in the end, even great savings won't save you from a singularity

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