Finding Habitable Worlds

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最近比较火的一部影片无疑是《流浪地球》了。但是想象一下如果人类真的无法逃避地球被太阳膨胀所吞噬的命运的话,那人类可能开着地球“逃跑”吗?

这个肯定不会是最好的方案!按照目前人类的发展来看的话,可以很确定的说,人类必然会“殖民”到其他的星球上,虽然人类目前还没有将其他行星改造成人类宜居星球的能力,但是不代表未来也没有哦!

The universe contains about 100 billion galaxies.

Each of those galaxies contains about 100 billion stars.

Many of those stars have planets orbiting them.

So how do we look for life in all that immensity?

It's like searching for a needle in trillions of haystacks.

We might want to focus our search on planets that we know can support life as we know it -- what we call habitable worlds.

What do such planets look like?

To answer that question, we don't look out there.

Instead, we look at ourselves. At Earth.

Because this is the one planet in the universe that we know for certain is habitable.

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