If Apophis did hit Earth, someone would get an extremely nasty headache indeed.

如果阿波菲斯撞击地球，恐怕有人真是要头疼万分了。

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In 2004, NASA scientists announced that there was a chance that Apophis, an asteroid larger than two football fields, could smash into Earth in 2029.

在2004年的时候，美国航空航天局的科学家们宣布阿波菲斯这个比两个足球场还大的小行星，可能会在2029年撞击地球。

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Scientists are confident it will miss, but Helfand said Apophis is a good reminder that killer asteroids are out there.

但赫尔方指出，“阿波菲斯”是个很好的例子，它提醒人们注意“杀手行星”的存在。

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One asteroid, the 300-m Apophis, will pass relatively close to Earth a number of times in the coming decades, including in 2029.

UNESCO: MEDIA SERVICES

Astronomers are currently trying to work out whether a 270-metre asteroid named 99942 Apophis will hit Earth in 2036 (probably not, but it would be nice to be sure).

ECONOMIST: Green.view: The threat from outer space | The

There is a so-called keyhole a narrow range of orbits that would return Apophis in 2036, should it pass through the keyhole in 2029.

ECONOMIST: The American Association for the Advancement of Science