When you look at the solar system, you might notice that the planets' orbits are tilted, and oddities in the protoplanetary ...

A new study explores how eccentric warm Jupiters - giant exoplanets with unusual oval orbits - form, offering clues about the ...

In early 2016, two planetary scientists declared that a ghost planet is hiding in the depths of the solar system, well beyond the orbit of Pluto. Their claim, which they made based on the curious ...

In a real-life twist on Star Wars' Tatooine—a harsh desert planet with twin suns and a criminal underbelly—astronomers have found a bizarre new world that orbits two stars at a perfect right angle.

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the distance ...

Mercury will retrograde, or appear to be moving backward in the sky, from August 23 through September 15. It's the third of four times Mercury will be moving in retrograde this year. Mercury isn't the ...