| 1. | A light-year is the distance light travels in one year at a speed of 299, 792 kilometers per second .
一光年是光以每秒299792公里的速度在一年中所走过的距离。 |
| 2. | The distance of a light year boggles the imagination
一光年的距离大得令人难以想象。 |
| 3. | Do you know how many meters is a light year
你知道一光年有多少米吗？ |
| 4. | A light - year is about 6 trillion miles , the distance light travels in a year
一光年大约6百亿亿英里，即光行走一年的距离。 |
| 5. | ? an approximately one - light - year tall " pillar " of cold hydrogen towers above the wall of the molecular cloud
顶部? ?一个大约一光年高的冷氢“塔柱”处在分子云墙的上面。 |
| 6. | [ top ] ? an approximately one - light - year tall " pillar " of cold hydrogen towers above the wall of the molecular cloud
顶部? ?一个大约一光年高的冷氢“塔柱”处在分子云墙的上面。 |
| 7. | The observable universe grows by a light - year every year as light from farther away has time to reach us
可观测宇宙的范围，会因来自更远处的光线到达我们这里而每年向外长大一光年。 |
| 8. | Light year , which is the distance traveled by light in one year . note that light year is a distance scale , not a time scale
为量度单位，一光年是光在真空中行走一年的距离，紧记光年是距离单位而不是时间单位。 |
| 9. | These have proven to be elusive subjects of study because existing telescopes do not have the resolution to see within a fraction of a light year of the central supermassive black hole , where these little black holes are thought to be concentrated most heavily
事实已经证明，这是一个很难研究的课题，因为现有的望眼镜不能看到在特大黑洞一光年以内的东西，那里才是人们所认为的、小黑洞聚集的地方。 |
