What is it on earth?

是“地球上是什么”？当然不是。

youdao

So far, humanity has only recorded sunrises on Mars and Earth, but it is fun to wonder what they would look like on planets known and yet unknown.

到目前为止，人类只记录下了火星和地球上的日出，但是猜想那些已知和未知的行星上的日出是一件非常有趣的事情。

youdao

That would be a depressing end to the story of habitable zones, if not for a series of amazing findings that life on Earth is not what everyone thought it was.

寻找地外生命的故事似乎又要惨淡收场，但一系列关于地球上生命的惊人发现告诉我们它们和人们一直以来的认为有所不同。

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"The radiation environment in deep space is several hundred times what it is on Earth, and that's even inside a shielded spacecraft, " Zeitlin said.

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We'll finish what we started, and remind the world just what it is that makes America the greatest nation on Earth.

WHITEHOUSE: Remarks by the President at a Campaign Event -- Tampa, FL

It is just a case of finding out what on earth happened to them.

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