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February 5, 2023


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Three-colour composition image of M51, the Whirpool galaxy. Located 23 million light years away, this magnificent spiral was observed using the instrument OSIRIS at the GTC, with an exposure time of 120 seconds. To reach a similar depth using a 1m telescope, an exposure time of more than three hours would be required. Credits: OSIRIS / Daniel López (IAC)
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