A burp of methane on Mars would indicate that the planet might be more alive than previously thought. But where did it come from?
NASA on Tuesday selected nine science instruments it believes will best address the burning question about whether Jupiter’s ocean-bearing moon Europa has indications of life.
Salt from an underground sea on Jupiter’s moon Europa may be seeping onto the surface, then darkening as it is exposed to radiation.
A wide-ranging search of faraway galaxies has turned up no obvious signs of advanced alien civilizations.
The iconic Hubble Space Telescope turns 25 this month, and getting the ball rolling on a life-hunting successor instrument would be a fitting birthday present, one prominent researcher argues.
Scientists have found complex organic molecules in a planet-forming disk of gas, dust and ice swirling around a very young star, evidence that the building blocks for life may be common in the universe.
Humanity is on the verge of discovering alien life, high-ranking NASA scientists say.
Astronomers have devised an instrument that could lift the veil of doubt over whether we're alone in the universe.
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