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Alien Worlds – Exoplanets

Astronomy Pioneers

Dwarf Planets of the Solar System

Famous Astronauts

Famous Comets and Asteroids

Great Observatories of the World

Historical Spaceflights

Humanity's Future in Space

Messier Objects

NASA's Space Missions

Types of Spacecraft

Theories of the Universe

Satellites of the Solar System

Space Shuttle Program

Spectacular Space Phenomena

Spacecrafts Through History

Space Exploration Robots and Rovers

Stars and Constellations

The Hubble Space Telescope

Dwarf Planets of the Solar System

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Eris

Diameter: ~2,326 km; Orbit: 557 Earth years; Atmosphere: Likely a thin atmosphere of nitrogen and methane

Makemake

Diameter: ~1,430 km; Orbit: 309 Earth years; Atmosphere: No substantial atmosphere, though traces of methane have been found

Pluto

Diameter: ~2,377 km; Orbit: 248 Earth years; Atmosphere: Nitrogen, methane, and carbon monoxide ices

Ceres

Diameter: ~946 km; Orbit: 4.6 Earth years; Atmosphere: Thin water vapor atmosphere, possibility of water ice

Haumea

Diameter (longest axis): ~2,322 km; Orbit: 285 Earth years; Atmosphere: Possible thin atmosphere, surface composed of water ice

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