| 1. | Rather, we infer that planetary systems must be quite common .
相反，我们的结论是行星系统的存在一定相当普遍。 |
| 2. | It is reasonable to suppose that other stars are also attended by planetary system .
有理由猜测别的恒星也伴有行星系统。 |
| 3. | Travel to the planetary systems of other stars is a much more formidable undertaking .
要航行到其他恒星的行星系中去是件极难实现的事。 |
| 4. | Finding planets orbiting barnards star would increase our confidence that planetary systems are common .
对环绕巴纳德里旋转的行星的发现将会增强我们认为行星系是普遍存在的信念。 |
| 5. | These tiny regions may be condensations in the interstellar gas where stars and planetary systems could be forming .
这些很小的区域可能是能够形成恒星或行星系统的星际气体中的一些凝聚体。 |
| 6. | 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。 |
| 7. | Extrasolar planetary system
太阳系外行星系 |
| 8. | Proto - planetary system
原行星系 |
| 9. | It s very exciting ; we re catching up with the advances of the higher planetary systems
这是很令人兴奋的事，我们正渐渐赶上那些较高等星球的发展水平。 |
| 10. | The salamanders chapter hails from a binary planetary system in the western reaches of the ultima segmentum
火蜥蜴军团的家园位于极限星系的西部边缘地带的行星上。 |
