評論
打印
Do you think there's life on other planets Don?
你認為其他行星上會有生命存在嗎？
It seems perfectly reasonable that there would be Yael.
似乎完全有理由相信有生命存在。
what with how unfathomably largethe universe is.Don't you think？
宇宙如此之大，深不可測，不是嗎？
I do.But then again, life is a tricky thing.
的確如此。但是話又說回來，生命的存在是一件極其有難度的事。
So much has to fall into place for the conditions for life aswe know it to be possible.
據我們所知，生命存在的可能性需要滿足眾多適合生存的條件。
For instance, a planet has to be just the right distance from the star itrevolves around.
比如說，行星與其所圍繞旋轉的恒星之間的距離是否適當。
How is that?
這有什么關系？
If it's too close to its star, the heat from the star would cause any water on the planet to boil away.
如果太近，來自恒星的熱量會導致行星上水分蒸發，
If it's too far away, the opposite problem occurs:the cold temperature would cause water to freeze.
與之相反，要是距離太遠，溫度太低會致使水凍結。
The range of distance from a star that will allow water to remain a liquid is called the habitable zone.
與恒星之間的距離要能保持水呈現的是液體狀態，這個范圍被稱作適居帶。
So we Earthlings are lucky I guess that we are just the right distance away from the sun.
那我們地球豈不是很幸運，與太陽之間的距離正當適宜。
Very lucky it seems.
是非常的幸運。
In 2007, scientists discovered the first two Earth-like planets outside our solarsystem that appear to be located near or within their star's habitable zone.
2007年，科學家們在太陽系以外首次發現兩顆類似地球，可能位于適居帶附近的行星，
Previously discovered planets have had masses more akin to Jupiter's.
而之前發現的行星更類似于木星。
The planets orbit the same star andare known as Gliese 581c and Gliese 581d.
這兩顆行星都圍繞格利澤581恒星轉動，因此他們被稱作格利澤581d和格利澤581c。
Wow,so there is other life out there?
哇！那探索到有生命存在嗎？
Not so fast, upon further investigation, it seems that Gliese 581d may be the only one of the two actually in the habitable zone, and its orbit seems to take it in and out of the zone.
沒那么快。據進一步調查研究發現，格利澤581d可能是二者中在適居區以內的行星，而且其運行軌道使其在適居區內游離。
Not tomention as I said, a lot of factors must come into play for life to exist.
更何況正如我所說的，生命存在還有諸多因素要考慮，
Being within the habitable zone is just one of them.
在適居區只是其中之一。
