At the beginning of the formation of a star , the gravitational attraction will pull the gas together 在一颗恒星形成初期，引力是演化的主导力量，令恒星不断收缩。
Once the redshifts of the galaxies have been measured , we can begin to reconstruct the history of star formation 一旦测得星系的红移，我们便可开始重建恒星形成的历史了。
A new model is developed to study the star formation and chemical evolution in globular clusters ( gcs ) in this thesis 本文对银河系球状星团中的恒星形成及化学演化进行了研究。
The deep observations have also traced the waxing and waning of star formation in the universe at large over cosmic time 回溯宇宙年代的深度观测，同时也追踪了整个宇宙恒星形成率的变化。
It would be able to map the magnetic fields of stars and exoplanets ( planets that circle stars outside the solar system ) 这样的一个装置将可以看到宇宙早期，那是大型结构例如星系和恒星形成的时候。
Such a device would look back at the early universe to the time when large - scale structures such as galaxies and stars formed 这样的一个装置将可以看到宇宙早期，那是大型结构例如星系和恒星形成的时候。
They questioned the usual assumption that star formation begins with cores containing at least one solar mass or more of material 他们质疑一般的假设：恒星形成起始的云核，含有至少一个太阳质量以上的物质。
When the universe was relatively young ? one billion years old ? the star formation rate was already high , about a third of its peak value 宇宙还很年轻时（ 10亿年左右） ，恒星形成率已经非常高了，大约是全盛时期的1 / 3 。
As the pace of star creation slows , the number of high - mass stars declines soon afterward because they die so quickly after they are born 当恒星形成的速率偏低时，大质量恒星的数量便会减少，因为它们在诞生不久后就消逝了。
Caption : : astronomers were surprised to discover a 25 - million - year - old protoplanetary disk around a pair of red dwarf stars 350 light - years away 天文学家一直认为恒星形成的同时一定会形成行星，但最近一项发现推翻了这定律。
