Sedna will reach its closest approach to the Sun in 2076, providing an exploration opportunity we won’t get for another ...

The planets in order from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. If you include the ...

Long theorized but never observed, the first known “planet with a death wish” is described by Ilin and her colleagues in a study published July 2 in Nature.

Exoplanets are the celestial bodies orbiting stars other than our Sun. Their small size makes them difficult to detect from Earth, particularly as they appear much dimmer than their parent stars ...