A rainbow-like halo surrounded the sun over Mexico City on Thursday, an optical phenomenon that triggered a social media frenzy.
If alien life does exist, scientists aren't sure what it would look like, but one cosmologists says such extraterrestrial creatures will be big — nearly 660 lbs. (314 kilograms), says a cosmologist who bases the estimate on statistics.
A wide-ranging search of faraway galaxies has turned up no obvious signs of advanced alien civilizations.
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.
The hunt for signs of life on planets beyond our solar system should cast as wide a net as possible, some researchers stress.
Cute, squishy face, bug eyes, and a penchant for peanut M&Ms? Increasing amounts of research suggest the alien life we've been searching for won't look like anything Hollywood has yet imagined. And it might exist without compounds we deem essential.
NASA's Dawn probe arrived at Ceres, becoming the first spacecraft ever to orbit a dwarf planet.
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