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The New York Times published evidence from Edwin Hubble (pictured) stating that the Andromeda Nebula, previously believed to be part of the Milky Way, is in fact another galaxy.

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The New York Times
American daily newspaper
The New York Times (NYT) is an American daily newspaper based in New York City. The New York Times covers domestic, national, and international news, and publishes opinion pieces, investigative reports, and reviews. As one of the longest-running newspapers in the United States,…Source: Wikipedia (CC BY-SA)
Edwin Hubble
American astronomer (1889–1953)
Edwin Powell Hubble was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology.Source: Wikipedia (CC BY-SA)
Andromeda Galaxy
Barred spiral galaxy in the Local Group
The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way. It was originally named the Andromeda Nebula and is cataloged as Messier 31, M31, and NGC 224. Andromeda has a D25 isophotal diameter of about 46.56 kiloparsecs (152,000 light-years)…Source: Wikipedia (CC BY-SA)
Milky Way
Galaxy containing the Solar System
The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galaxy, which are so far away that they cannot be…Source: Wikipedia (CC BY-SA)