Image stacking is a technique that astronomers use to combine several frames of a video or several photographic images to reduce noise and improve sharpness. Although it's been used for many years, with powerful computers and easy-to-use software, it's made it possible for amateur astronomers to produce images that rival the quality of those from large ground-based telescopes or even the Hubble Space Telescope.
The video below is a short tutorial from Carolina Sky Astronomer that shows how it's done using off-the-shelf software. The difference between the original and final images is remarkable.
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