“to register the colorful nebulas”
You don’t think that red is an exaggerated color?
yes, this picture and many others posted in Astronomy Picture of the Day, are fake. there is NO WAY stars are this abundant with sun set light still present... and there is NO WAT that vivid of purple is visible to the nekid eye EVER!!
anymore, I click into these post to see how far the fakeness has gotten. and am continually startled at how many buy it!!