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Saturn's moon has never-ending winter

Millions of years of snowfall on Enceladus boost promise of subsurface ocean.

Climate researchers warn of data crisis

Looming gaps in satellite coverage challenge sustained climate observation.

Comets take pole position as water bearers

Matching chemical signatures indicate that Kuiper comets brought water to Earth.

Europe looks to Russia after NASA falls short on ExoMars

The US agency's shrinking budget and growing space-telescope costs are squeezing other projects.

Dragon offers ticket to Mars

A cargo carrier designed for low Earth orbit could provide a cheap route to the red planet.

Stellar performance nets physics prize

Nobel for supernovae signals of accelerating Universe.

Astronomers gear up for asteroid fly-by

An unusually close near-Earth asteroid gets observers excited.

Galileo gets ready for take off

Europe's satellite navigation system enters test phase.

Exoplanet's misstep raises doubts

Astronomers argue over object's status after it unexpectedly veers off course.

Megatelescopes look for support

As a huge European observatory nears approval, a National Science Foundation funding competition between equivalent US projects remains in a holding pattern.

Russia takes aim at Phobos

Mission to Martian moon is the country's first interplanetary attempt since 1996.

Simulated Mars mission 'returns' to Earth

Six crewmen survived 520 days of isolation, but experiment was limited in its realism.

Military surveillance data: Shared intelligence

The military has a vast array of scientifically valuable data — some more accessible than you think.

Sun-watchers hope giant telescope will get green light

Observatory would reveal structures that trigger sunspots and space weather.

Time is running out for the leap second

Abolition would see 'official' time unmoored from the Sun.