For years, everyone assumed our solar system’s eight planets (nine, when Pluto was within the fold) were the whole story. Planets, moons, asteroids, comets, and that’s all — case closed. But there’s a ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration of Uranus and its five largest moons, Miranda, Ariel, Umbriel, Titania and Oberon. In an alternate timeline, ...

We have an idea of what the solar system's past was like: It was violent and chaotic. However, we are still studying how violent it was. Current models suggest that at some point after their formation ...

Add Yahoo as a preferred source to see more of our stories on Google. Digital art of distant planet - Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by ...

But what exactly is a planet? It seems like an easy question. After all, you’re standing on one right now! But the scientific ...

Uranus, an ice giant planet and the seventh planet from the sun, may be warmer than previously thought. The third largest planet in the solar system — previously thought to be the coldest despite ...

As astronomers continue discovering unusual worlds beyond our solar system, many say the question that divided scientists in ...

Uranus, the seventh planet in the solar system, located between Saturn and Neptune, has long been a mystery. But by analyzing observations made by NASA’s Hubble Space Telescope over a 20-year period, ...

A U.S. government lab has recreated the truly alien conditions that melt diamonds deep inside ice giant planets—and the technique could triple the energy gains for some fusion reactors.