When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

The discovery of a new asteroid this month has turned out to be Elon Musk's Tesla Roadster launched by SpaceX in 2018.

This is the last chance to catch the pair in conjunction this year—with Venus set to be unusually bright in the night sky.