So the irony of these large cosmic structures is that if you were within them or in there proximity you wouldn't know. I mean you could see if you were in a nebula by the dust and gas you could detect in most or all directions. But you probably couldn't tell how that would look from 10,000 light years away.
But there's a distance where such structures would probably fill the night sky because you were close but not too close. Some of these structures aren't necessarily visible to the naked eye, even if close, but some are. I wonder what that would do if you were on a planet where the horsehead nebula (or something similar) filled the sky and its brightness rivalled the Moon.
But there's a distance where such structures would probably fill the night sky because you were close but not too close. Some of these structures aren't necessarily visible to the naked eye, even if close, but some are. I wonder what that would do if you were on a planet where the horsehead nebula (or something similar) filled the sky and its brightness rivalled the Moon.