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King of KBOs: Pluto<br />
1978年再发现了冥王星的卫星Charon, 直至1995年才由HST<br />
获得能区分出两者的照片.<br />
KBOs的发现, 再次带来老生常谈的疑问:冥王星是否行星?<br />
轨道、位置、大小、质量、组成、反照率……<br />
Pluto & Charon (HST 1995)
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