Our Solar System has eight planets, a few dwarf planets and more than 200 moons. But wait. Are you seeing double? Or did every planet suddenly get a twin? Where would each planet’s double fit in? Why ...

Journey to the farthest reaches of our solar system and uncover the mysteries of Sedna, a reddish dwarf planet that orbits the Sun once every 11,400 years. Explore its strange orbit, icy surface, and ...

Earth-like atmospheres require precise balances of nitrogen, oxygen, and CO₂, supported by long-term geological and biological processes. Most M-dwarf planets face atmospheric loss due to intense ...

Two asteroid-sized objects orbiting a famous star have collided, Hubble Space Telescope images suggest. The collision provides a rare look at a young star at a time when planets have already formed ...

In a span of 30 years — from the first moon rockets in 1959 to the Voyager 2 flyby of Neptune in 1989 — NASA spacecraft introduced the world to close-up views of the bodies in our solar system.

Astronomers on Mauna Kea found the first space object on which NASA’s Roman Space Telescope can test its imaging technology. The National Weather Service has issued a High Surf Warning for north- and ...