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Originally Posted by Tokolosh
They normally do that with infrared images and also to enhance photos that have been affected by light pollution.
Besides, almost all photography is photoshopped nowadays.
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Also, a lot of things in space are only visible on a photo when you have a really long exposure time.. I guess a galaxy looks rather boring if you look at it 'real time'. Not even close to the bright, wonderful images you find in astronomy books.. or do they?