| 1. | - sirius ? - just to the left , two stars over
-天狼星-就在左边,两颗星外 |
| 2. | Sirius ? - just to the left , two stars over
天狼星-就在左边,两颗星外 |
| 3. | But what about making the shot by banking the ball exactly twice against the cushions
但是我们可以找到两颗星的解法吗？ |
| 4. | A binary star is a double star , consisting of two stars turning round each other
双星是两颗星，是由相互围绕旋转的两颗星组成。 |
| 5. | However , these two stars are maintained standstill before they were moved over and after moved away
那麽，在移过来之前和移回去之后的长时间里，这两颗星却在保持静止不动。 |
| 6. | In other words , the two stars have positive and negative electric charges and therefore they are attracted each other electronically
也就是说，这两颗星带有相反的电荷，因而会产生静电引力。 |
| 7. | The postures in the diagrams with arm stretching illustrate how to measure roughly the distance between two stars
要对大小有一个概念，只要将手伸直，利用图中的方法就可以量度两颗星之间的大约距离。 |
| 8. | We could further assume that the two stars have the same mass of 1 . 5 times of the sun ' s mass , or 297 thousand billion billion billon kilogram
我们还可以进一步假定，这两颗星的质量相同，都是太阳质量的1 . 5倍，即都是297万亿亿亿公斤。 |
| 9. | Many stars orbit around other stars under the mutual gravitational attractions . if two stars orbit around one another , they form a binary star system
在天空中，不少恒星会在相互的引力下互相绕著对方运行，假若系统只有两颗星，我们会称之为 |
| 10. | Two stars have the same absolute magnitude . one is thousand times farther away than the other . what is the difference in apparent magnitudes ? which magnitude larger
两颗星具有相同的绝对星等，其中的一颗比另一颗距离远1000倍，它们的目视星等有何不同？哪一个的星等数值大？ |
