该证据的一部分来源于灶神星的密度,另一部分来源于数以百计以陨石形状存在的大块岩石,
that have been examined by Earth-bound scientists.
地球科学家们已对这些岩石进行过研究。
These rocks are believed to be the result of an asteroidal prang that happened many millionsof years ago and left a crater 460km across, which dominates Vesta s southern hemisphere.
这些岩石据说是几百万年前的小行星碰撞的结果,并在灶神星的南半球形成了一个跨度为460公里的陨石坑。
The reason they are thought to come from Vesta is that the asteroid has an unusual andcharacteristic spectrum.
它们被认为来自灶神星是因为这颗小行星有着不同寻常的特征光谱。
It shares this with a number of smaller asteroids whose orbits suggest they were spalled off inthe collision, and with about 5% of the meteorites which fall to Earth.
一些更小的行星也具有这样的光谱,从它们运行的轨道来看,它们是灶神星在碰撞中的脱落物,拥有的陨石数量约是落到地球表面陨石数量的5%。
Such meteorites look like igneous rocks from Earthhence the belief that Vesta has amantle.
这种陨石与地球上的火成岩相似因此可以相信灶神星上有地幔存在。
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