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The rocky world will be visible for a brief window after sunset.

"…are we potentially the last generation that will see the night's sky in its entirety?"

The space telescope spied three young stars in the nebula.

A plume of molten rock deep beneath eastern Africa is pulsing upward in rhythmic surges, slowly splitting the continent and potentially marking the birth of a new ocean, a new study reports.

MethaneSAT was meant to check on industrial-level methane emissions.

As the sun grew hotter, so did Mars, prompting much of its atmospheric carbon dioxide to rain out and ultimately get locked up in rocks.

Some planets take the expression "you're your own worst enemy" to the extreme — triggering stellar flares from their own parent stars by being too clingy.

Space.com sat down recently with retired NASA astronaut Terry Virts to talk about space, politics and his run in Texas for a seat in the U.S. Senate.

The European Space Agency launched the Giotto space probe to learn more about this special comet.

Our Red Planet explorers may encounter a peculiar threat.