例句與造句

1. Lewin was closely involved in ROSAT observations of the nearby galaxies M31 and Messier 81.
2. Due to its relative proximity, large size and active galactic nucleus, Messier 81 has been studied extensively by professional astronomers.
3. "' NGC 3738 "'is a dwarf galaxy lying in the constellation of Ursa Major, located about 12 million light-years from the Sun, and belongs to the Messier 81 group of galaxies.
4. SN 1993J was a type IIb supernova at almost the same distance as SN 2014J, because it was located in Messier 81, which together with Messier 82 and NGC 3077 forms the core of the M81 group of galaxies.
5. It's difficult to find messier 81 in a sentence. 用messier 81造句挺難的