The solar system, long believed to be a relatively stable and isolated system of planets, moons, and distant bodies, may have experienced a dramatic shift caused by an unexpected interstellar visitor.

A Feb. 22 Instagram post (direct link, archive link) claims a form of navigation that relies on celestial objects such as the sun, moon and stars proves the Earth is flat and stationary. "The Ancients ...

The SwRI-led Lucy mission will survey eight asteroids in 12 years with one spacecraft, breaking records in its epic journey to Jupiter’s Trojan asteroids. (Photo courtesy of SwRI via Courthouse News) ...

The International Astronomical Union defines a planet as a celestial body that orbits the sun, is massive enough that gravity has forced it into a spherical shape, and has cleared away other objects ...

Meet comet C/2025 F2 (SWAN): a celestial body glowing green as it swings around the sun, currently visible in the early morning hours with backyard gear, such as small telescopes or binoculars.

Scientists at NASA for the first time have been able to observe the make up of Pluto and other small and icy celestial bodies in the outer solar system. They had expected to find that the surfaces of ...