Moons orbiting distant worlds have a new nickname, and it's even cuter than "moonmoon."
More than 4,000 photographers shot for the moon (and beyond) for the Astronomy Photographer of the Year competition in the U.K.
Signals written in elements from the early universe have revealed the oldest known merger between two galaxies, taking place less than a billion years after the Big Bang.
Three letters written by Einstein are up for auction, and they offer an intriguing view of his thoughts on quantum physics.
The former leader of the U.S. government's top-secret UFO program has stories to tell, and he is sharing some of them for the first time in a new documentary.
Between 2014 and 2015, seasoned pilots in the U.S. Navy experienced a number of harrowing encounters with UFOs during training missions in the U.S.
This is the strongest evidence to date of these oddball structures existing in the space between stars.
A black hole was recently the first to be captured in a close-up image, and in another first, it received a name that's a lot more interesting than the ones that usually identify black holes.
Scientists recently unraveled a physics puzzle that has stymied experts since the dawn of quantum mechanics.
Can two versions of reality exist at the same time? Physicists say they can — at the quantum level, that is.
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