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  3. Researchers say they have discovered new details about the day an asteroid hit Earth and killed off the dinosaurs. Scientists be

Researchers say they have discovered new details about the day an asteroid hit Earth and killed off the dinosaurs. Scientists be

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问题     Researchers say they have discovered new details about the day an asteroid hit Earth and killed off the dinosaurs. Scientists believe the asteroid struck the Earth about 65 million years ago near what is today Mexico’s Yucatan Peninsula. The force of the massive asteroid crash is estimated to have been equal to the strength of about 10 billion nuclear bombs. The U. S. Space Agency NASA has estimated the strike created a huge hollow about 180 kilometers wide and 900 meters deep.
    The event is believed to have caused widespread wildfires, earthquakes and ocean waves. It also released chemicals into the atmosphere, leading to severe cooling that harmed many living things. The hollow remained hidden until the late 1970s, when it was first discovered beneath the ocean by a team searching for petroleum. The theory about an asteroid causing the extinction of the dinosaurs was first presented by two American scientists in 1980.
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答案 研究人员说，他们已经发现了有关小行星撞击地球并导致恐龙灭绝那天的新细节。科学家认为，这颗小行星大约在6 500万年前撞击地球，地点在今天的墨西哥尤卡坦半岛附近。据估计，大规模小行星撞击的力量相当于约100亿枚核弹的强度。美国宇航机构美国宇航局估计，这次撞击形成了一个大约180千米宽、900米深的大坑。 有人认为该事件引起了广泛的野火、地震和海浪。它还将化学物质释放到大气层中，导致严重降温，从而伤害了许多生物。这个坑一直隐藏到20世纪70年代后期，直到一个寻找石油的团队首次在海底发现了它。1980年，两位美国科学家首次提出了小行星导致恐龙灭绝的理论。
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