Aliens may be mediocre just like Earthlings, which could explain why humanity hasn't heard from advanced civilizations yet.
Radiation from beyond the solar system may destroy any organic fossils lying on the surface of Mars or Jupiter's icy moon Europa.
A paper published Feb. 24 claiming to have located the source of a mysterious type of energetic radio burst may have a fatal flaw, some scientists say.
Tiny satellites could hitch a ride into orbit and spot alien worlds from afar, new research suggests.
An enormous gas cloud in the early universe has a very small amount of the heavy elements that would form in later stellar generations, suggesting that it was "polluted" by the very first stars.
Once life gets started in dense stellar groups, it could quickly go interstellar, thanks to old stars and close neighbors.
A cosmic lightsaber, trillions of miles long, slices through the dark clouds of dust and gas that surround it in a new image captured by NASA's Hubble Space Telescope.
Mars may one day have rings like Saturn's, if the Red Planet manages to completely crush its innermost moon, Phobos.
A sudden spurt of liquid water on Mars could potentially create deep lakes today, new research suggests.
A slight wobble in the orbit of Saturn's moon Enceladus can only be explained by a global ocean beneath its crust.
The slow death of the universe was revealed in 21 wavelengths, as scientists map the energy of a nearby region of space.
Earthquakes occur every day, but most people don't notice the small ones. Here's what causes earthquakes.
Amazing new images of the Eagle Nebula's iconic Pillars of Creation from the Hubble Space Telescope reveal how the nebula has changed 20 years after Hubble's first photo of the region.