Physical Size
A scroll-driven journey through the scale of the universe, from subatomic structures to the largest known cosmic systems.
Venus
Earth
Neptune
Terrestrial planet
Earth
The only known world with life, shaped by surface oceans and active geology.
Earth is the largest of the four rocky planets and the only world known to host life. Liquid water has covered most of its surface for billions of years, shaping both its geology and its atmosphere.
- diameter
- 12,742 km
- Age
- ~4.54 billion years
- Composition
- Silicate rock and iron core
- Orbits
- Sun
- Temperature
- ~288 K mean surface
Image: NASA / Apollo 17 crew · Public domain · Wikimedia Commons