RT @NASAhistory: Happy #birthday to astronomer Edwin Hubble, born #OTD in 1889. Hubble proved that the universe contains multiple galaxies, rather than just the Milky Way. He's the namesake of @NASAHubble! Learn more about his life here: https://t.co/RoxotLaSyF https://t.co/iT4iLtgmtf
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