Twenty years ago, the Huygens probe achieved humanity's first landing on a moon in the outer solar system when it touched ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

“Saturday evening, January 18: Venus and Saturn will appear nearest to each other. As evening twilight ends at 6:15 p.m. EST, ...