Researcher weighs the earth ever tens of second bump by minor planet

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Xinhua net Washington on April 25 report (reporter Ren Haijun) at present a kind of the most popular scientific hypothesis thinks, a diameter makes an appointment with the asteroid of 10 kilometers to ever bumped the earth to cause dinosaur to eradicate, and American spaceflight bureau says 25 days, an international studies group analysis thinks, the world has sufferred the asteroid of 10 several similar volume possibly in evolution process to bump.

The evidence of researcher comes from Australia the tiny ball bead of measure of the millimeter in old rock. Researcher thinks, these tiny ball bead are the eject after minor planet bumps the earth strongly the lava dust in aerospace, harden to fall to the earth's surface again after they are cooling, form finally in earthly terrane very thin but layer of widespread tiny ball bead.

The computer simulation result of researcher shows, be in 3.8 b m the best selling mountain t shirts ost popular selling plant lights illion before coming 1.8 billion years, about 70 had bumped the earth furniture light with the likeness of minor planet build that causes dinosaur to eradicate or largish asteroid, its frequency outclass estimates before this; During this, the moon has sufferred the asteroid of 4 similar volume to bump.

Rich of · of Williams of expert of planet of southwest institute of research group chief scie the most popular selling the most popular selling ntist, United States overcomes especially say: "Layer of tiny ball bead told about the earth to suffer the history of concent the best selling loony tunes golden rated bombard, and the origin of layer of tiny ball bead before this is a mystery all the time. And the origin of layer o free furniture light f tiny ball bead before this is a mystery all the time..

spring poolRelevant research report is published 25 days in England " natural " on the magazine. Researcher thinks, their analysis also supports a such theory: Jupiter, Saturn, Uranus, Neptune is formed at 4.5 billion years before, but the ability they are 4 billion years ago moves to go up to existing orbit gradually below the influence of solar system gravitation, cause large-scale comet and asteroid to bump planetary incident inside solar system limits.

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