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SAN FRANCISCO -- Venus and Mars, planet Earth's two closest neighbors, have been inching ever closer to each other during the month of July. Monday night, they promise to put on a show, appearing at ...

A large planetary alignment will be visible after sunset. Learn which planets you can see and when the next alignments happen.

Six planets are set to align on Saturday, creating a planetary parade that will be visible to sky-gazers across the globe.

It was likely debris from Kosmos 482 — a Soviet spacecraft launched in 1972 as part of a mission to Venus. The launch failed. The probe never made it to its ...

Uranus and Neptune orbit in the dim, cold depths of the outer solar system. Neptune absolutely requires a telescope to ...