| 1. | In the h - r diagram below , our sun is now in the main sequence
在以下的赫罗图中，太阳正位于主序上。 |
| 2. | From the two h - r diagrams below , we can also tell which cluster is older and which is younger
由以下两幅赫罗图中，我们可断言右图表示的星团比较年老。 |
| 3. | And we will see that the mass is the most important factor that determines the fate of a star
绘画在赫罗图上，你将会发现恒星的质量是主宰其命运的决定性因素。 |
| 4. | We know the luminosity is directly related to the absolute magnitude . so , in practice , we usually use absolute magnitudes instead
由于光度和绝对星等有直接的对应关系，所以很多时赫罗图会选用绝对星等。 |
| 5. | The hertzsprung - russell diagram serves this purpose . it is a plot of absolute magnitude against surface temperature i . e . , spectral type of stars
简单来说，赫罗图把大量恒星的绝对星等和表面温度或谱型关系以图表方式显示出来。 |
| 6. | Before the interstellar cloud contracts , it was very cold and dim . thus , the cloud is represented by a point at the right in the h - r diagram
在星际云收缩之前，它非常冰冷，所以在这个阶段，星际云会位于赫罗图上一个极右的位置。 |
| 7. | Since the average life span of human is relatively short compared to that of stars , we have to study a large number of stars in order to deduce the time scales of different evolutionary stages of stars
相对于恒星的一生，人类的生命实无异于昙花一现。要以有涯逐无涯，人类唯有研究大量的恒星，再尝试找出恒星的演化过程，赫罗图便是最重要的研究工具。 |
| 8. | Upon contraction under its own gravity , the interstellar cloud heats up , and thus moving to the left in the diagram . note that the position of a star in the h - r diagram shows its physical properties , not its position in the sky
当星际云收缩，它会变得越来越热，而它在赫罗图上的位置亦会向左移动注意：恒星在赫罗图上的位置显示了它们的物理特性，而非其在天空的位置。 |
| 9. | We expect stars with short life span are already dead . when we plot the stars of a cluster in the h - r diagram , we see the more massive stars , which are stars in the upper left , have already evolved off the main sequence
换句话说，星团内寿命短的星应该已经死去，当我们把星团内的星以赫罗图的形式绘画出来时，我们发觉位于图中左上角的大质量恒星果然已经步入死亡阶段，离开了主序星的行列。 |
