Astronomers have uncovered evidence of a spectacular collision of two planets within the confines of a faraway solar system, providing us with a rare chance to observe firsthand the extremes of ...

A researcher discovered the rare cosmic event by noticing strange dips in a star's brightness in old telescope data. The collision created a hot cloud of rocks and dust, which researchers detected ...

The formation of Mercury remains an unsolved mystery. The planet closest to the Sun has a disproportionately large metallic core – accounting for about 70% of its mass – and a relatively small rocky ...