1.
The sidereal year is not used to construct a calendar.
恒星年不用于编制年历。
2.
a sidereal year
恒星年((365日6时9分9.54秒))
3.
The Age-metallicity Relation of Stars in Different Stellar Populations;
不同星族恒星的年龄—金属丰度关系
4.
Around young stars, disks are found to range in shape.
在年轻恒星周遭的气盘，外形各有不同。
5.
Detection of uranium is needed to determine the accurate age of this star.
检测铀则需要准确判定年龄这颗恒星.
6.
A star can persist like this for 10 billion years.
这样的恒星可以持续一百亿年以上。
7.
An average of one new star is born in our galaxy each year.
平均每年在我们的星系中诞生一颗新的恒星。
8.
Inside the nebula lies an open cluster of bright young stars designated NGC2244.
于星云中躺著一群由明亮年轻恒星组成的疏散星团，名为NGC2244。
9.
Note3: Actinide abundance ratios may be applied to measurements of stellar ages.
注3:锕充足比率可用于测量恒星的年龄.
10.
A heavy star at the upper end of the main sequence has a rather different later history.
在主序上端的大恒星具有很不相同的晚年史。
11.
These stars are sometimes called poulation II stars.
这些恒星有时称为星族Ⅱ恒星。
12.
A star in the constellation Leo, approximately43light - years from Earth.
德尼波拉星狮子座的一颗恒星，距地球大约43光年
13.
Nearly12.5 million light-years away in the dwarf galaxy NGC4449, a veritable stellar" fireworks" is on display.
在近1.25亿光年远的矮星系NGC4449中，正在展现一场真正的恒星“烟火”。
14.
The brightest star in the constellation Cygnus, approximately1, 630light - years from Earth.
天津四，天鹅α星在天鹅座最亮的一颗恒星，距地球大约有1，630光年
15.
On the Record in the Night of April 5, 687B.C.: Stars were not Seen and Stars Fell Like Rain at Midnight
论鲁庄公七年夏四月辛卯夜,恒星不见,夜中星陨如雨
16.
dispersion ring
弥散环 -恒星运动
17.
If one-third of the stars are single stars with planets, then planetary systems are born, on the average, every three years.
如果这些恒星中有三分之一是拥有行星的单星，那么平均每三年就会诞生一个行星系。
18.
Indeed, in a young cluster of a given age, the percentage of brown dwarfs with disks is comparable to the percentage of stars with disks.
在相同年龄的年轻星团里，带有气盘的棕矮星比率，确实与带有气盘的恒星比率相当。