DescriptionHalpha sharp.jpg English: Andromeda Galaxy captured with an amateur telescope from the Israeli Negev desert. This is an RGB image + some h alpha...
edu/public/images/gemini0302c URL: https://noirlab.edu/public/media/archives/images/large/gemini0302c.jpg determination method or standard: JImagehash perceptual hash...
diffraction grating to detect three emission lines from gas in the galaxy. Halpha is the brightest line emitted by Hydrogen gas at 6563A. The [NII] lines...
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