: Why are other planets and stars and all that colourful galaxy not visible in the sky the same way we see the moon and sun in our everyday mundane lives with naked eyes?
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Others have given good answers. All those things are visible in the sky. Our own galaxy is visible; it’s the Milky Way, and in August, the night sky is facing the center of it. If you take a picture of the sky with a fisheye lens in an area with no light pollution on a dark August night, our galaxy appears with the central bulge and all, stretched from horizon to horizon. Here’s an example: http://www.atscope.com.au/newsky/fisheyegx.jpg
The reason you don’t see colors in night sky objects is because you have two kinds of receptors in your eyes. One kind called “cones” can sense colors, and the other kind called “rods” can sense brightness. The color receptors don’t work well at low light levels, so you don’t see colors well at night. The colors appear in photographs, however, because camera film (and nowadays digital sensors) respond to colors of any brightness.
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