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

Some stargazers are calling it a planetary parade: Every other planet in our solar system can be seen in the sky tonight.

Venus will pass to the north of the much-fainter bluish star Regulus (in Leo, the Lion) on the morning of Sept. 19; the planet and star will appear low in the east-northeast predawn sky, separated by ...

Auroras are beautiful phenomena on Earth, but they aren't specific to this planet. In fact, they appear on many other planets ...

It seems 2025 will have a strong start, too, with a planet parade just a few weeks into the new year. A planet parade is when ...

If Brown’s hidden world is real, Rubin will almost certainly find it or strong indirect evidence that it exists. “In the ...

This January, the night sky offers a stunning display featuring the Quadrantid meteor shower and a rare alignment of four bright planets visible in a single view. Witness Mars at opposition, shining ...

For billions of years, it's kept our star system well organized through the influence of its powerful gravity. All the planets revolve ... of certain objects in the solar system.

Called Kepler-51, the Sun-like yellow dwarf star was found in 2012 to have three exoplanets in its orbit; each, it would turn ...

A "domino effect" may occur in star systems whereby newly formed planets ... moons in all star systems. However, exactly how that happens for a multi-planet star system — like our solar system ...