A similar phenomenon happens to the planets of our solar system, Shull added.
类似的情况在太阳系的行星中也有发生。
But that gas escapes from Earth into space shortly after the gas's formation, Shull said.
但这些气体产生后立刻就逃离地球进入太空了。
With Hubble's help, Shull and his team detected a specific wavelength of UV light emitted from distant quasars about 11 billion years ago.
通过哈勃的帮助，Shull和他的团队检测到11亿光年外的特殊波长的宇宙射线。
"A lot of them held on to their cores, and they had to wait until this period was done before they could start bringing in gas again," Shull said.
很多氦离子紧绕在星核附近，等到这一时代的到来才开始从新吸入气体。
"A lot of them held on to their cores, and they had to wait until this period was done before they could start bringing in gas again," Shull said.
很多氦离子紧绕在星核附近，等到这一时代的到来才开始从新吸入气体。
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