Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to oblivion ...

Answer 17: A meteoroid is a small rocky or metallic body in space. A meteor is the streak of light produced when a meteoroid enters Earth’s atmosphere. A meteorite is a meteoroid that survives passage ...

Before defining what a light-year is, we should define what a light-year is not: It is not a measure of time, but rather a ...

Scientists are racing to learn as much as possible about the interstellar comet 3I/ATLAS before it fades from view forever ...

How do we know 3I/ATLAS, also called comet C/2025 N1 (ATLAS), is interstellar? Will it strike Earth? Can we visit it? Here ...

Astronomers have just discovered what might be the oldest comet ever seen by humanity—an ancient visitor that predates our solar system by billions of years. This interstellar object, named 3I/ATLAS, ...

How does a 15-kilometer-wide comet, moving at 152,000 miles per hour, slip into our solar system undetected until a global ...

The skies overhead are already teeming with satellites. But their orbiting numbers will skyrocket in the near future as the ...

Our galaxy will make for a particularly splendid sight on the dark nights surrounding the new moon phase on July 24.

There could be many more satellite galaxies orbiting the Milky Way than previously thought or observed, according to ...

Astronomers have discovered the earliest seeds of rocky planets forming in the gas around a baby sun-like star, providing a ...

Stars passing close to the sun could cause planets to collide, including with Earth, or even be ejected as rogue planets, new simulations show.