冥王星可能与它最大的卫星卡戎披着同一件薄薄的“披风”——天文学家推测,冥王星大气层中的氮气可能会流到卡戎上。如果这个推测得到证实,那么冥王星和卡戎将成为矮行星同自己的卫星共享大气层的第一个例子。卡戎的直径大约是冥王星的一半,而且运行轨道距离冥王星很近。早在20世纪80年代,一些研究就指出这两个星球之间可能存在气体交换。但是,当时研究人员假设冥王星的大气层主要由甲烷组成,而且甲烷以较快的 Pluto may be wearing the same thin “cloak” as its largest satellite, Charyon, - astronomers speculate that the nitrogen in Pluto’s atmosphere may flow to Charon. If this speculation is confirmed, then Pluto and Charon will be the first examples of dwarf planets sharing the atmosphere with their satellites. Charon is about half the diameter of Pluto, and the orbit is very close to Pluto. As early as the 1980s, some studies pointed out that there may be a gas exchange between the two planets. However, at the time, researchers assumed that the atmosphere of Pluto consisted mainly of methane, and that methane was faster