Planetary scientists are waiting eagerly for July, when the Dawn spacecraft is due to arrive at asteroid Vesta. If greater complexity makes for greater scientific interest, they're in for a bonanza. The asteroid belt's second-most-massive body has had quite a complicated life. It melted early on to form an iron core and rocky mantle and crust, spewed volcanic outpourings, and then suffered a massive impact. Now, to spice things up even more, a group of impact modelers is arguing that the object that crashed into Vesta and reshaped its geology was eight times as massive as previously thought. "Vesta really gets messed up by this impact," impact specialist H. Jay Melosh of Purdue University in West Lafayette, Indiana, said at the meeting.
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机译：行星科学家们热切地等待着七月，那时黎明飞船将到达小行星维斯塔。如果更大的复杂性引起更大的科学兴趣，那么他们将是一个巨大的财富。小行星带的第二大质量物体的生活相当复杂。它很早就融化形成铁心，岩石地幔和地壳，喷出火山喷发物，然后遭受了巨大的冲击。现在，为了使事情变得更加有趣，一群碰撞建模师争辩说，撞入维斯塔并重塑其地质结构的物体的质量是以前认为的八倍。印第安纳州西拉斐特市普渡大学的冲击专家H. Jay Melosh说：“这种冲击真的弄糟了维斯塔。”
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