Sentences with phrase «cloud were visible to the naked eye»
If the cloud were visible to the naked eye, it would stretch about 10 to 12 degrees across the sky, about as wide as the constellation Orion.
https://www.newscientist.com/ Not exact matches
Although this is what Messier discovered, it is interesting that, within this stellar cloud which is easily visible to the naked eye, there's a dim open cluster, NGC 6603, of magnitude 11.