Yes, any image you see of nebulas or galaxies is a "stack" of exposures. Even when it's from just one night.
Also, this image is done with a monochrome camera and filters, with a total of 5 channels (Luminance, RGB and Hydrogen alpha).
Also, this image is done with a monochrome camera and filters, with a total of 5 channels (Luminance, RGB and Hydrogen alpha).
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