几乎所有地球上的氦早已风吹走了在这个星球上可利用的只有一小部分——它的大部分可以在北美的天然气田找到。
Almost all Earth's helium has long since blown away and only small amounts are available on the planet — much of it can be found in the gas mines of North America.
这个星球的居民是否在科技上领先于地球？
Are the planet's inhabitants technologically superior to Earth's?
格利泽的系统尤为使我们感到兴奋，因为它距离地球很近，在将来利用天文望远镜，我们或许就能直接关发到这个星球上是否有生命的存在。
'The Gliese system is particularly exciting to us as it's very close to Earth, relatively speaking. So with future generations of telescopes, we'll be able to search for life on Gliese 581d directly.
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