Dwarf planet 2023 KQ14, Ammonite, has a stable orbit that challenges the hypothesis of the mysterious Planet Nine.

The moon and Venus will shine vividly alongside a bright star in the early morning in a celestial rendezvous that should be visible across the U.S.

NASA says its Hubble Space Telescope has detected a white dwarf star that consumed fragments of a Pluto-like object. Space ...

Pluto is a bit of a loner. The dwarf planet is no longer considered a regular planet; it does not orbit on the same plane as ...

NASA's Hubble Space Telescope detected material from a Pluto-like body spiraling into a white dwarf star 260 light-years away ...

TRAPPIST-1e shows no signs of its first atmosphere, but hints of a secondary one remain. Liquid water could still be possible ...

Now, finding a young planet like this is a fairly difficult task, as it requires a long and patient hunt for young disk ...

My favorite planet, besides the one I live on, is on the rise in the low eastern Butler sky during evening twilight. It’s ...

The Solar System is vast, made up of eight planets, countless moons, and millions of asteroids, all orbiting the Sun. But like any territory, it has a boundary. This boundary is invisible, yet it ...

SKYWATCH: This year marks the 50th anniversary of the discovery, just inside Jupiter’s orbit, of Kohoutek, a comet synonymous ...

Regulus, a distant star, Venus and our moon will be visible during a conjunction tonight, and how Californians can best see ...

Astronomers predict it will pass relatively close to four planets (but not Earth) and the Sun, then continue its cosmic ...