Like snowflakes, no two galaxies are exactly alike. However, all galaxies have certain features in common, which means we can group them into categories. Though there are many ways to do this, most people still use the system developed by Edwin Hubble in 1925. Hubble grouped galaxies according to two distinct shapes: elliptical and spiral.

Canadian Heritage Information Network
Australian Museums & Galleries Online, Australia; Centre of the Universe; Gemini Observatory, Hawaii; Glenbow Museum; The Manitoba Museum; National Research Council Canada; Planétarium de Montréal

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