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哈勃望遠鏡發現了一個新的月球圍繞冥王星
Hubble Discovers a New Moon Around Pluto
二○一一年七月二十日:天文學家利用哈勃太空望遠鏡已經發現了第四月球軌道冰冷的矮行星冥王星。這種微小的,新的衛星 - 暫時指定P4 - 突然出現在哈勃調查尋找戒指周圍的矮行星。
新的月球周圍發現的最小的冥王星。據估計直徑為8至21英里(13至34公里)。相比之下,冥衛一,冥王星最大的衛星,是648英里(1,043公里)之間,與其他衛星,尼克斯和Hydra,在範圍20至70公里直徑(32至113公里)。
July 20, 2011: Astronomers using the Hubble Space Telescope have discovered a fourth moon orbiting the icy dwarf planet Pluto. The tiny, new satellite – temporarily designated P4 -- popped up in a Hubble survey searching for rings around the dwarf planet.
The new moon is the smallest discovered around Pluto. It has an estimated diameter of 8 to 21 miles (13 to 34 km). By comparison, Charon, Pluto's largest moon, is 648 miles (1,043 km) across, and the other moons, Nix and Hydra, are in the range of 20 to 70 miles in diameter (32 to 113 km).
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