揭晓神秘冥王星卫星：三颗卫星原为一体

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冥王星与神秘的三颗卫星：冥卫一、尼克斯和许德拉

腾讯科技讯（悠悠/编译） 据美国太空网报道，2005年6月，科学家发现环绕冥王星的两颗较小卫星，它们距离远超过较大的卫星冥卫一。同年，发现这两颗卫星的美国西南研究所行星天文学家艾伦-斯特恩一直在思考如何对它们进行命名。2006年6月21日，这两颗卫星被命名为“尼克斯”和“许德拉”，它们是希腊神话中的女神和神兽。事隔五年，目前科学家对这两颗神秘卫星的认知和了解逐渐加深，以下是揭开它们神秘面纱后的“真实面目”。
微小的卫星
尼克斯卫星比许德拉卫星更昏暗、体积更小，其距离地球大约42亿至75亿公里。这两颗卫星均十分昏暗，天文学家从远处观测很难精确地描述其体积大小。目前，天文学家有信心地认为这两颗卫星的直径小于80公里。
命名
“尼克斯（Nix）”在希腊神话中是掌管黑暗和夜晚的女神，她的母亲是卡戎(Charon)——运送死灵渡过冥河进入冥神的地下世界。“许德拉(Hydra)”是长着多个头颅的巨蛇，被赫拉克勒斯(Hercules)杀死。尼克斯和赫拉克勒斯的名字中带有“N”和“H”,代表着“新地平线号(New Horizons)”航天器，该航天器将于2015年抵达冥王星及其卫星进行勘测，有望揭晓更多的秘密。[全文]



2011-06-22 07:24   来源：腾讯网

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