Astronomers have discovered a rocky exoplanet that lies just 21 light-years from Earth — closer than any other confirmed rocky alien world.
A vast cluster of dead galaxies roughly 300 million light-years from Earth may hold as much as 100 times more dark matter than visible matter, researchers say.
NASA’s Kepler mission has discovered the first near-Earth-size planet in the “habitable zone” around a sun-like star, the agency announced Thursday.
A new image from the New Horizons spacecraft’s Pluto flyby has revealed a second mountain range within a heart-shaped region on the dwarf planet’s surface.
A NASA camera on the Deep Space Climate Observatory has captured its first view of the entire sunlit side of Earth from one million miles away.