“孩子们会一直喜欢冥王星，才不管它是微小行星、矮行星还是行星。冥王星就是冥王星，它将一直在那儿。”

对于冥王星来说,更是如此.它依然围绕太阳旋转着,在自己的轨道上.悄无声.

它不理睬,有多少人,在开会,在评议,为它的分类争论不休.它依然是它.人们可以在教科书

词典以及其他文献里变换对于它的称呼,它依然故我.依然那样运行着.

有孩子们的喜欢足够了.即使,孩子们不都是喜欢它,也无所谓.70年前他被"发现了,此前它就在

运行呢,以后,他依然还会,按照自己的感到运行的.这不是表决可以改变的."

参考文献:

The Mass of Dwarf Planet Eris

Michael E. Brown^* and Emily L. Schaller

The discovery of dwarf planet Eris was followed shortly by the discovery of its satellite, Dysnomia, but the satellite orbit, and thus the system mass, was not known. New observations with the Keck Observatory and the Hubble Space Telescopes show that Dysnomia has a circular orbit with a radius of 37,350 ?140 (1-) kilometers and a 15.774 ?0.002 day orbital period around Eris. These orbital parameters agree with expectations for a satellite formed out of the orbiting debris left from a giant impact. The mass of Eris from these orbital parameters is 1.67 x 10²² ?0.02 x 10²² kilograms, or 1.27 ?0.02 that of Pluto.

Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.