Welcome to Mercury!
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Mercury, the closest planet to the Sun, zips around our star faster than any other, completing an orbit every 88 Earth days! Despite being closer to the Sun, Mercury is not the hottest planet. Its thin atmosphere cannot trap heat, leading to dramatic temperature variations between day and night. Imagine this contrast!
Fascinating Mercury Facts
- Diameter: 4,880 kilometers
- Day Length: About 59 Earth days
- Atmosphere: Mostly composed of oxygen, sodium, and hydrogen
Discover more about its craters, surface features, and history with missions:
NASA Mercury Overview