英语听力：自然百科 穿越银河系的旅行 Through Milky Way—33
时间：2014-05-27 08:00:19
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（单词翻译）
Venus is closer to the Sun, Mars is farther from the Sun. And there is a zone in between, the blazing hot furnace Venus, the frigid1 Mars. That zone in between we call a habitable zone and the earth lies smack2 in that thing where water would be in liquid form, not in steam too hot, not in ice form too cold but rather a temperature that, as goldilocks said,
is just right for life.
The location of this habitable green zone depends on the star. With hot blue stars, the green zone is further out. With cooler red stars, it's closer in. Every star in the
Milky3 Way must have a habitable zone. The question is do they also have planets within them.
In 1995, something happened that was extraordinary, I’d got a call from my
collaborator4 Paul Butler and all he said was ，Jeff ，come over here, and it was a moment that I would never forget. I was silent, Paul was silent and we were just
stunned5. They are on the computer screen I saw the unmistakable signature of a planet.
Jeff / discovered the first planet around another star. But he couldn't actually see it because the planet itself was too small and dim.
Any planet orbiting a star is lost in the glare of that host star that outshines by a factor of a billion. And so instead, to detect planets, we watch the stars. And in fact, the star will wobble in space because it's yanked on gravitationally by the planet or planets orbiting that star and by watching the star alone, we can determine whether the star has planets and how far out those planets are from the host star.
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