彗星撞击地球

1

也有的人认为是彗星撞击地球导致恐龙的灭亡。

Or some people think a comet hit the Earth .
2

南非学者表示他们发现大约2800万年前彗星撞击地球的证据—地点是埃及西部的一处沙漠。

South African academics say the evidence they 've found indicates the comet hit the earth some 28 million years ago-in a desert in western Egypt .
3

该台行星专家还多次参加关于彗星、小行星撞击地球危险性的国际学术讨论会。

This station 's planet experts also attended many international scientific seminars on the dangers of comets and asteroids colliding with Earth .
4

这次观测彗星撞击木星对于研究和预测彗星撞击地球具有十分重要的意义。

This incident of observing of the comet colliding with Jupiter possesses extremely important significance in researching and forecasting comets colliding with Earth .