It's a real-life mystery cliffhanger. We've come up with a list of possible reasons a large crater on the biggest object in the asteroid belt looks lit up like a Christmas tree.
The Rosetta spacecraft casts some shade on the surface of its comet buddy, creating an otherworldly shadow selfie from orbit.
An exploding star directly behind a cluster of enormous galaxies has been split into four images by the light-bending properties of the cluster's gravity.
If the two black holes meet, they could release as much energy as 100 million supernova explosions as they shatter their galaxy, a new study finds.
Scientists have found a black hole 12 billion times more massive than the Sun that was formed so soon after the Big Bang it's challenging what we know about black holes.
Rosetta swoops near Comet 67P for a series of images highlighting the comet's fascinating surface features.
Long fingerlike tendrils poked out from the part of the Red Planet known as the "Martian limb" and astronomers are scratching their heads over the cause.
The Martian surface displays colors other than just red in this beautiful image just released by the European Space Agency.
Hubble has taken a photo of what seems to be a smiling cartoon face in the depths of space -- an effect produced by a phenomenon known as gravitational lensing.
Looking like a deathtrap in a movie, this room at one of the ESA's test centers plays a critical role in satellite building.