⚪ Dwarf planet
Eris
A far-off world about as big as Pluto, whose discovery changed what counts as a planet.
- Size
- 2,400 km across, 19% as wide as Earth
- A day lasts
- 25.9 hours
- A year lasts
- 557 Earth years
- Moons
- 1
- From the Sun
- 10 billion km
- Discovered
- 2005
Did you know?
- Finding it started the debate that made Pluto a dwarf planet in 2006.
- Before it had an official name it was nicknamed “Xena”.
Compare Eris with EarthSide by side, to scale, in the app
More NASA photos of ErisStraight from NASA’s image library, in the app
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All of solar system
Mercury
The smallest planet, and the closest to the Sun.
Venus
The hottest planet, hidden under thick clouds.
Earth
Our home, the only world known to have life.
Mars
The red planet, with the tallest volcano in the solar system.
Jupiter
The biggest planet, with a storm larger than Earth.
Saturn
The ringed giant, light enough to float in water.