There's no shortage of round celestial objects in our universe. Planets, moons and stars all exhibit lovely spherical shapes.

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

NASA's Perseverance rover is exploring a new Mars region called Krokodillen, which is thought to harbor some of the oldest and most intriguing rocks on the Red Planet.

People always want to know what will happen to Earth when the sun eventually swells up as a red giant. For one thing, the ...

As the rocky planets begin to settle into their orbits, Proto-Earth and Thea uncover the Sun’s true purpose for the Solar ...