[11] Muller's breakthrough was to find a way to date" how long ago any particle was melted--meaning he could build up a picture of whether the moon gets a constant barrage or suffers spells of intense bombardment.
[12] He said; "The evidence clearly shows that the moon has gone through spells of relatively frequent impacts and others of reduced intensity. I believe it is likely that this is because the Oort Cloud is being disturbed by a massive body that is throwing comets out of stable orbits, a small fraction of which could reach the Earth."
[13] Muller and others believe that the dark star probably takes about 26m years to complete an orbit around the sun.
[14] Other scientists have already noted that mass extinctions of life on Earth seem to occur in a pattern with gaps equivalent to multiples of 26m, suggesting some regular event is causing the comets to come Earth's way.
[15] The best-known such event was the one that wiped out the dinosaurs 65m years ago, but that was not the worst; the planet has suffered several such large mass extinctions
[16] Astronomers have found the first Earth-sized planet orbiting another star. The discovery raises the chances of finding planets that could support life as we know it.
[11]马勒的突破是他找到了一种确定粒子被融化的年代的方法,这意味着他可以确立这样一幅画面,即月球是受到接二连三的轰击还是经历了间歇性的强烈的粒子辐射。
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