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

Out past Neptune are countless small icy and rocky bodies called Trans-Neptunian Objects (TNOs), and many of these have moons ...

From an astrological point of view, there are hardly two words that elicit a stronger reaction than Mercury retrograde.

A combination of cosmic processes shapes the formation of one of the most common types of planets outside of our solar system ...

Astronomers have identified a quartet of small rocky planets orbiting Barnard's star - one of our closest stellar neighbors - ...

Four small, newly discovered worlds are less than six light-years away from Earth, and their discovery reinforces a ...

A quartet of small, rocky exoplanets likely circle Barnard's Star, around 6 billion light-years from Earth, putting them in ...

Mercury in Pisces is decidedly more mutable, leading with curiosity rather than cutting to the quick. The danger of Mercury in Pisces is the muddying of messages and the tendency to slip into half ...

While planets, Mercury included, do not move backwards, they do slow their proverbial rolls, a deceleration that looks like a reversal from our vantage here on beautiful, broken planet Earth.

A combination of cosmic processes shapes the formation of one of the most common types of planets outside of our solar system, according to a new study.

This is the only known star with a multi-planet system entirely comprised of planets smaller than Earth. The innermost planet ...

Astronomers have discovered four planets that are just a fraction of the mass of Earth orbiting Barnard’s Star, which is 6 ...