The departing Galileo spacecraft looks back on the home planet in 1996.

Planets More Hospitable Than Earth?

Maybe in the short term, but not in an evolutionary sense.

Artist's view of the Philae lander anchored to comet 67P/Churyumov-Gerasimenko.

Europe’s Comet Lander Wakes Up, Takes Aim

Rosetta zeroes in on a rock from the far reaches of our solar system

Dyson Spheres: Still Missing, Maybe Impossible

Searching for the ultimate alien artifacts

Yellowstone's last big eruption dumped ash over much of North America.

Taking the Measure of Yellowstone’s Supervolcano

Still a threat, but don't cancel your vacation just yet.

The lakes in Titan’s northern hemisphere

A New Map of Titan’s Lakes

Ligeia Mare, one of the largest methane lakes on Saturn's moon, has about twice the volume of Lake Michigan

Water Plumes on Europa: What Lies Beneath?

Newly discovered geysers may make the exploration of Jupiter's icy moon much easier

The Sheepbed Mudstone on Mars. Low salinity, tolerable acidity and other traits would have made this ancient lake hospitable to life

Curiosity – And a New Meteorite Find – Show That Mars Was Once Habitable

The chances of finding Martian fossils just went up


MAVEN Heads for Mars

Its goal: to help scientists understand why the Martian atmosphere all but disappeared.

The solar system beckons: Cassini spacecraft view of Saturn, looking back toward the inner planets

Think Space Exploration Isn’t Moving Fast Enough? You’re Not Alone.

Playing it safe won't get us to the stars


New Asteroid Lands on List of Earth-Threatening Objects. Don’t Get Excited.

You can worry when the Torino score gets to 5


Is Silicon-Based Life Possible?

As we look for biosignatures on other planets, we should guard against being too Earth-centric


Life on a Rogue Planet

Planets with no host stars wouldn’t be very hospitable, but life might still find a way to hang in


Ingredient of Plastic Found on Titan

Cassini’s latest find hints at more exciting discoveries to come


Mystery of the Martian Methane

Curiosity’s failure to find this possible marker of life makes the puzzle more interesting

The "diatom" in question.

Life Raining Down from Space?

Not likely

More than 60 years after Fermi posed his famous question, "they" still haven't shown up.

The Fermi Paradox Revisited

If we haven’t heard from extraterrestrials, maybe it’s because we’re not using the right technology—yet


The Top 12 Habitable Exoplanets

Researchers at the University of Puerto Rico are keeping a list


LADEE and Life

The moon may be a dead rock, but NASA’s newest lunar mission holds interest for astrobiologists


Did Life Come Here From Mars?

It's still an intriguing theory, but still unproven.

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