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Today's APOD includes a wonderful picture of the galaxy I Zwicky 18. It is an odd one which was originally believe to be one of the youngest galaxies on record but recent pictures by the Hubble space telescope have confirmed that there is an old population of stars but there has been a vast amount of recent star formation - making it appear young.
Credit: NASA, ESA, and A. Aloisi (ESA & STScI)
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