Red giants exist for only a short time—perhaps just a billion years compared with the ten billion the same star may already have spent burning hydrogen like our own sun.
红巨星只在短期内存在——可能只有十亿年，相比起来，像太阳这样的恒星将在百亿年中持续燃烧它们的氢。
As the star condenses and compacts it heats up even further, burning the last of its hydrogen and causing the star's outer layers to expand outward.
恒星聚缩时甚至继续升温，这个过程燃尽了残存的氢，并导致恒星外层向外膨胀。
It is no more a human question than whether a river should continue to flow or a star should continue burning in the night sky.
它不是人的问题，正如一条河是否应该继续流动或一颗星星是否应该继续在夜空中闪烁一样。
But as long as the star has enough nuclear fuel in its core to keep burning, it pushes back.
但是，只要恒星的核心有足够的核燃料一直燃烧，就会往外推。
As the nuclear burning moves outward to the fresh material in a shell surrounding the core, the star bloats into a so-called red giant.
当核燃烧向外进行到核心周边壳层的新物质时，恒星会膨胀成所谓的红巨星。
As the nuclear burning moves outward to the fresh material in a shell surrounding the core the star bloats into a so-called red giant.
当核燃烧向外进行到核心周边壳层的新物质时，恒星会膨胀成所谓的红巨星。
You posed your burning questions for Chelsea and England star Frank Lampard in our exclusive WAP chat. Find out what Frank made of some very tough questions…
大家在我们专有的网上聊天室送来了你们对切尔西和英格兰球星弗兰克·兰帕德的许多问题。看看弗兰克回答了哪些难以回答的问题。
You posed your burning questions for Chelsea and England star Frank Lampard in our exclusive WAP chat. Find out what Frank made of some very tough questions…
大家在我们专有的网上聊天室送来了你们对切尔西和英格兰球星弗兰克·兰帕德的许多问题。看看弗兰克回答了哪些难以回答的问题。
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