《行星撞地球》是一款射击类网页游戏。
行星撞地球这种事每隔一亿年左右才会发生一次。
They hit the Earth roughly every hundred million years or so.
小行星撞地球的可能性很小，但这样的危险还是存在的。
It's very unlikely that an asteroid will crash into Earth but the danger exists.
Nibiru和其它行星撞地球的故事是一个网上的骗局，这些说法都没有事实依据。
Nibiru and other stories about wayward planets are an Internet hoax. There is no factual basis for these claims.
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