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
Location of Earth
Earth's location in the Universe
- Universe – all of time and space and its contents.
- Observable universe – spherical region of the Universe comprising all matter that may be observed from Earth at the present time, because light and other signals from these objects have had time to reach Earth since the beginning of the cosmological expansion.
- Virgo Supercluster – one of the approximately 10 million superclusters in the observable universe. It spans 33 megaparsecs (110 million light-years), and contains at least 100 galaxy groups and clusters, including the Local Group.
- Local Group – specific galaxy group that includes the Milky Way and at least 53 other galaxies, most of them dwarf galaxies.
- Milky Way Galaxy – a specific barred spiral galaxy
- Orion Arm – a spiral arm of the Milky Way
- Solar System – the Sun and the objects that orbit it, including 8 planets, the 3rd planet closest to the Sun being Earth
Movement of the Earth
Features of Earth
This sphere represents all water on Earth, wherever it is and in whatever form within the water cycle.
- Water, by relative altitude
Astronomical events on Earth
Natural satellites of Earth
History of Earth
Future of Earth