these contours can be used to quickly determine the important physical properties of a planet including its p0p0 (central pressure), p1/p0p1/p0 (core–mantle boundary pressure over central pressure), ...

The different speeds of the planets mean that, on occasion, several of them can be roughly lined up on the same side of the Sun. From Earth ... to change the name of the planet's largest gulf.

Among the planets ... word 'Earth' reflects a fascinating tapestry of ancient languages and cultural evolution. But who exactly coined the name, and how did it come to refer to our planet as ...

A very rare treat is about to grace Earth's night skies.

Yes, six planets will be visible in the January night sky. And yes, they'll be in a line. But because planets always appear in a line from our Earth-bound ... known as a "planet parade," though ...