What is a Planet? - NASA Science

The Definition of a Planet What is a planet? According to the Merriam-Webster dictionary, the word planet goes back to the ancient Greek word planēt, and it means “wanderer.” The International Astronomical Union (IAU) – the group of astronomers that names objects in our solar system – planets originally were defined as objects that moved […]

Solar System Exploration - NASA Science

A guide to the planets of the Solar System - BBC Sky at Night Magazine

Bringing the solar system to life in 3D with NASA

Would the entire object known as the (Oort cloud) having a

Planetary Science - NASA Science

Is Earth a planet?--Aleteia

Would the entire object known as the (Oort cloud) having a

Are there different strengths in energy when 2 planets form an

NASA Scientists Discover Clue in Mystery of Shrinking Planets

672 Search Results for Ceres