核心坍塌是否能产生GRB的关键因素，似乎在于原来恒星临终时的质量与转动速率。
The deciding factors for whether a core collapse produces a GRB appear to be the mass and rotation rate of the progenitor star at the time of its death.
太阳穿过一些固定的恒星在一条被称为黄道的轨道上运行，经过一年的时间才回到原来的位置。
The sun moves through the fixed stars on a path called the ecliptic, taking a year to return to its original position .
当燃尽了氢储备后，这颗恒星膨胀成了一颗所谓的红巨星，是原来尺寸大小的几十倍甚至几百倍。
As it burned through its supply of hydrogen, the star would have swelled to become a so-called red giant, tens, or even hundreds of times its original size.
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