the-star-stuff: Dec. 30, 1924: Hubble Reveals We Are Not Alone 1924: Astronomer Edwin Hubble announces that the spiral nebula Andromeda is actually a galaxy and that the Milky Way is just one of many galaxies in the universe. Photo: Edwin Hubble’s 1920s observations of Andromeda (whose ultraviolet spectrum is rendered here) expanded our notions of the size and nature of a universe that is itself expanding.Galaxy Evolution Explorer image courtesy NASA. And the rest as they say, is history…

the-star-stuff:

Dec. 30, 1924: Hubble Reveals We Are Not Alone

1924: Astronomer Edwin Hubble announces that the spiral nebula Andromeda is actually a galaxy and that the Milky Way is just one of many galaxies in the universe.


Photo: Edwin Hubble’s 1920s observations of Andromeda (whose ultraviolet spectrum is rendered here) expanded our notions of the size and nature of a universe that is itself expanding.
Galaxy Evolution Explorer image courtesy NASA.

And the rest as they say, is history…

Source: the-star-stuff
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    And the rest as they say, is history…
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