NASA has discovered a new world, named Gliese 12 b. It is roughly the size of Earth, lies in the habitable zone, and orbits every 12.8 days.

Seven planets will line up for a rare "planetary parade" today (Feb. 28) and you can watch it live online, beginning at 12:00 p.m. ET (1700 GMT).

Astrology intertwines the 12 zodiac signs with their ruling planets and unique lucky numbers. Understanding these celestial connections reveals insigh ...

A Milky Way-surveying spacecraft found a planet 12 times more massive than Jupiter, along with a brown dwarf, each distantly orbiting stars smaller than the sun. Scientists have dubbed the ...