Prior to 2040, the last planetary quintuplet occurred in the year 1186, and according to Uptain, records show that the close ...

Getting from Earth to space isn’t just about speed—it’s about planning the right trajectory. The Moon, our closest neighbor, ...

Mars and Jupiter dominate the late evenings, providing many hours of planetary observation with tantalizing features to see in small scopes. Both the inner planets, Mercury and Venus, stand ...

A new classification scheme may help us better understand planet formation — including the history of our own family of worlds.

Worldwide, the best day to see the alignment is today, Feb. 28. Mercury, Venus, Mars, Jupiter, Saturn, Neptune and Uranus could all be visible with clear skies, but not all can be seen by the ...