Mars has two moons, Phobos and Deimos. Scientists still debate whether these came from asteroids that passed close into Mars' ...

Each evening, enjoy a sweeping view of four planets at once. Also look for Mars occulted by the Moon and meteors!

Astronomers are on the hunt for a mysterious ninth planet, known as Planet Nine, which could change our understanding of the solar system. Is this hidden world real, or just a myth?

• Saturn, of magnitude +1.1, 16° to the upper left of Venus. The brighter planet will pass 2.2° north of Saturn on Jan. 18; Saturn will be nearly 11° below Venus on Jan. 31. A telescope reveals Saturn ...

The Webb Telescope reveals new insights into icy planetesimals, shedding light on the early solar system's evolution.

When 'Oumuamua traversed our solar system ... many rogue planets are in our solar system's vicinity. In our solar neighborhood, which extends to a radius of six parsecs around the sun, there ...