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Edwin Hubble announced the existence of other galaxies on January 1, 1925.

Despite the opposition, Edwin Hubble, then a thirty-five-year-old scientist, had his findings first published in The New York Times on November 23, 1924, and then more formally presented in the form of a paper at the January 1, 1925 meeting of the American Astronomical Society. Hubble's findings fundamentally changed the scientific view of the universe. 
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Carnegie Observatories' Wendy Freedman On Hubble and Size of Universe

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Edwin Powell Hubble (1889 - 1953)
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Edwin Powell Hubble (November 20, 1889 - September 28, 1953) was an American astronomer who profoundly changed the understanding of the universe by confirming the existence of galaxies other than our own, the Milky Way.
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Hubble's Expanding Universe Red Shifts The Big Bang



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Hubble is credited with a discovery that paved the way for modern astronomy. In 1929, he published a paper in which he reported on a correlation between the distance of galaxies from Earth and their velocities. Later dubbed Hubble's law, the correlation shows that the further away a galaxy is, the more its light shifts towards the red end of the spectrum. This redshift implies that galaxies are moving away from the Earth, and later astronomers interpreted it as evidence that the Universe seems to be expanding.
But Hubble was not the first to notice this correlation. In 1927, the Belgian astronomer Georges Lemaître published a paper in French, which gave a theoretical description of the same relationship. Lemaître also used data from others to derive the constant governing the expansion, known today has Hubble's constant.
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Title: A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae.
Authors: Edwin Hubble

Determinations of the motion of the sun with respect to the extra-galactic nebulae have involved a term of several hundred kilometres which appears to be variable. Explanations of this paradox have been sought in a correlation between apparent radial velocities and distances, but so far the results have not been convincing. The present paper is a re-examination of the question, based on only those nebular distances which are believed to be fairly reliable.
Distances of extra-galactic nebulae depend ultimately upon the application of absolute-luminosity criteria to involved stars whose types can be recognized. These include, among others, Cepheid variables, novae, and blue stars involved in emission nebulosity. Numerical values depend upon the zero point of the period-luminosity relation among Cepheids, the other criteria merely check the order of the distances. This method is restricted to the few nebulae which are well resolved by existing instruments. A study of these nebulae, together with those in which any stars at all can be recognized, indicates the probability of an approximately uniform upper limit to the absolute luminosity of stars, in the late-type spirals and irregular nebulae at least, of the order of (photographic) = -6.3.[1] The apparent luminosities of the brightest stars in such nebulae are thus criteria which, although rough and to be applied with caution, furnish reasonable estimates of the distances of all extra-galactic systems in which even a few stars can be detected.

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Edwin Powell Hubble (November 20, 1889 - September 28, 1953) was an American astronomer. He profoundly changed our understanding of the universe by demonstrating the existence of other galaxies besides the Milky Way. He also discovered that the degree of redshift observed in light coming from a galaxy increased in proportion to the distance of that galaxy from the Milky Way. This became known as Hubble's law, and would help establish that the known universe is expanding.
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Edwin Powell Hubble
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The namesake for NASAs most important telescope, Edwin Hubble has been called a modern-day Galileo. He identified multiple galaxies and helped to define the way in which the universe expands, providing evidence for the Big Bang theory.
Edwin Powell Hubble was born on November 20, 1889, in Marshfield, Missouri.
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More than a decade after proposing a sculpture to honour astronomer and former New Albany High School teacher Edwin Hubble, sculptor David Ross Stevens had to dig the model out of a storage barn, where it was stored near a lawn mower.
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Stevens, who lives and works in rural Clark County, had given up hope of creating a full-sized version of the bronze and stucco piece to hang in the school hallway, a tribute to the famous scientist for whom the Hubble Space Telescope is named.

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Edwin Hubble: The Name Behind the Telescope
Early next year the Hubble Space Telescope will receive its fifth visit from NASA space mechanics. Since its launch in 1990 The Hubble has done much for the advancement and popularity of astronomy, just as its namesake increased our knowledge of the night sky eight decades ago.

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