Portal:Astronomy/Picture/23 July 2005

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M33.jpg

The Triangulum Galaxy is the third-largest member of the Local Group, after the Andromeda Galaxy and the Milky Way. It was one of the earliest galaxies which was proved to be external to our own, by Edwin Hubble in 1926; before then, astronomers believed the so-called ‘spiral nebulae’ were objects within our own galaxy.