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Millions of years of snowfall on Enceladus boost promise of subsurface ocean.
Astronomers argue over object's status after it unexpectedly veers off course.
Observatory would reveal structures that trigger sunspots and space weather.
An unusually close near-Earth asteroid gets observers excited.
Six crewmen survived 520 days of isolation, but experiment was limited in its realism.
As a huge European observatory nears approval, a National Science Foundation funding competition between equivalent US projects remains in a holding pattern.
Abolition would see 'official' time unmoored from the Sun.
Matching chemical signatures indicate that Kuiper comets brought water to Earth.
Europe's satellite navigation system enters test phase.
Mission to Martian moon is the country's first interplanetary attempt since 1996.
A cargo carrier designed for low Earth orbit could provide a cheap route to the red planet.
Nobel for supernovae signals of accelerating Universe.
The military has a vast array of scientifically valuable data — some more accessible than you think.
The US agency's shrinking budget and growing space-telescope costs are squeezing other projects.
Looming gaps in satellite coverage challenge sustained climate observation.
