To receive the same amount of starlight as Mars receives from our sun, a planet orbiting an M-type red dwarf would have to be positioned much closer to its star than Mercury is to the sun.

Astronomers have spotted 3I/ATLAS, just the third interstellar object ever seen in our solar system. Bigger, faster, and possibly far older than ‘Oumuamua or Borisov, this icy traveler could help ...

This invisible boundary, located about 100 astronomical units (AU) from the Sun (one AU is the distance from Earth to the Sun ...

There are quirks at the far edge of our solar system, in the form of disturbed objects in the Kuiper belt. One explanation: Planet Nine.

Science Did you know that Jupiter does NOT orbit the sun? It's true! This giant planet in our solar system doesn't play by the same rules as its other neighbors.