冥王星

The planet that became a dwarf planet, and turned out to have mountains of ice and a heart-shaped plain.

Pluto was discovered by Clyde Tombaugh in 1930 and was considered the ninth planet until the IAU defined the term planet in 2006. It is a dwarf planet in the Kuiper belt.

NASA’s New Horizons flew past in 2015 and revealed mountains of water ice and Sputnik Planitia, a vast plain of nitrogen ice. Its largest moon, Charon, is so big relative to Pluto that the two orbit a point in space between them.

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数据来源

• NASA NSSDCA Planetary Fact Sheet
• JPL SSD: Planetary Physical Parameters
• JPL Small-Body Database