These huge groups of stars, gas and dust can be many thousands of light years across.

VOA: special.2009.01.20

Gee, have you ever wondered how they know the composition of stars that are light-years away?

嘿！你曾经是否想过,他们是怎么知道那些离我们好几光年远的,星星的位置的？

麻省理工公开课 - 固态化学导论课程节选

The big question for American now is whether there will be light at the end of the tunnel after more than 8 years of war there, after all that life lost and fouture spent.

现在对于美国一个重要的问题就是,是否有曙光的出现,8年的战争中，美国政府花费了大量的金钱，很多人也因为战争也失去了生命。

普林斯顿公开课 - 国际座谈会课程节选

"Now,if you're on a star about 1,000 light years away, you see earth as it was 1,000 years ago.

VOA: standard.2010.04.16

"Even an optimist like Frank Drake estimates that there would be no more than about in the galaxy, which means that the nearest one is likely to be about 1,000 light years away."

VOA: standard.2010.04.16

He was born in this very light house eighty three years ago.

VOA: special.2010.05.08