| 1. | Other galaxies are placed irregularly in space .
其它星系不规则地位于太空中。 |
| 2. | Our galaxy is a continuously evolving system .
我们的星系是一个不断演化的星系。 |
| 3. | Most galaxies occur in pairs or in small multiple groups .
大多数星系成双或几个成一小群。 |
| 4. | There is a curious feature in the spectra of spiral galaxies .
在旋涡星系的光谱中有一种奇妙的特征。 |
| 5. | 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。 |
| 6. | Most galaxy associations are small and have a low density contrast .
大多数星系协是小的，密度反衬低。 |
| 7. | Galactic nebulas are masses of diffuse material within our galaxy .
银河星云是我们星系中的一团团弥散物。 |
| 8. | The universe as a whole contains billions of comparable galaxies .
整个宇宙，包含亿万个可以比拟的银河系。 |
| 9. | They reported that younger galaxies should be significantly bluer .
据他们报道，较年轻的星系颜色应该显著地偏兰。 |
| 10. | To understand galaxy formation we would like to think of gravitation .
为了理解星系的形成，我们总要想到万有引力。 |
