主序是指赫罗图上从左上（高温、高光度）至右下（低温、低光度）大部分恒星集聚的序列，位于其上的恒星处于核心氢聚变阶段。
... principal orbit ==> 主轨道 principal order ==> 主序 principal order module ==> 主序模 ...
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(我们的太阳会在大约50亿年内离开主序)。
Our sun should leave the main sequence in about 5 billion years.
在历经主序星、红巨星和白矮星或中子星后演化为致密星体而结束一生。
During the radiation stars will develop in turn into main sequence stars, red giants, white dwarfs or neutron stars, etc.
恒星的质量越大，它消耗氢燃料的速度也就越快，它在主序中停留的时间也就越短。
The greater the mass of such a star, the more quickly it will use its hydrogen fuel and the shorter it stays on the main sequence.
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