[For example](https://www.nasa.gov/sites/default/files/styles/side_image/public/thumbnails/image/s84-27018.jpg?itok=iwWtIpvc)
In: Earth Science
Take a picture of a streetlight at night and check out the stars in the background.
To properly expose an image onto a CCD (digital) or film the amount of light has to be properly balanced. Too much and things are overexposed and blown out. Too little and it’s all dark. Right in between gets you a balance of both. Just right in between means you can’t expose the brightest things and the darkest things at the same time. There are compromises. Shadow detail and stars are the compromises.
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