The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...

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

Jan. 16, 2025 — A research team has discovered another piece in the puzzle of the formation of the Moon and water on Earth ... type of planet unlike anything found in the Solar System.

The four planet-strong "planet parade" currently visible to the naked eye in the night sky for a short time after sunset will ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But do other planets in the solar system have them too?

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

The solar system is portrayed ... a reality show. If planets could talk, they’d be whispering about each other faster than Mercury on an espresso binge. Mercury on Earth "Thinks it’s the ...

NASA said the system is thought to be moving at least 1.2 million miler per hour, nearly twice as fast as our solar system.