Outline of Earth
The following outline is provided as an overview of and topical guide to the planet Earth: Earth – third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life. == Classification of Earth == Astronomical object Gravitationally rounded object Planet Planet of the Solar System Inner planet Terrestrial planet == Location of Earth == Earth's location in the Universe Universe – all of time and space and its contents.