You’d think we’d have the solar system pretty well figured out by now. It’s our own cosmic backyard, after all. […] ...

The celestial body's unusual orbit “implies that something extraordinary occurred" in the early days of the solar system—and ...

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...

The star is surrounded by a protoplanetary disk, and this disk is the first evidence of debris condensing into what will ...