extragalactic space造句

例句与造句

1. A photon travels through extragalactic space.
2. Are there any known stars that are no longer part of the Milky Way but are just floating away in extragalactic space ? talk ) 17 : 54, 21 February 2010 ( UTC)
3. It's difficult to find extragalactic space in a sentence. 用extragalactic space造句挺难的