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    Hubble's 25th anniversary in photos

    Hubble's 25th anniversary in photos

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    Hubble's biggest image ever: Andromeda
    This is a 1.5 billion pixel image of our nearest neighbor in the universe: M31, otherwise known as the Andromeda galaxy. Published at the beginning of 2015, it is the biggest Hubble image ever released, and it shows a 40,000 light-year section of Andromeda that contains over 100 million stars. Be sure to check out the interactive version (click here).