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Whose observations first showed that galaxies come in many forms, not just “spiral nebulae”?
Quick Answer
Edwin Hubble classified galaxies into ellipticals, spirals and irregulars in the 1920s. His work helped modernize galaxy astronomy.
The Full Story
Edwin Hubble used observations at Mount Wilson Observatory to classify galaxies by shape and appearance. In the 1920s he separated them into ellipticals, spirals and irregulars, replacing the older term “spiral nebulae.” This classification helped astronomers understand that galaxies are diverse systems rather than simple cloud-like objects. Hubble’s work became a basic framework for extragalactic astronomy.
Key Facts
1.Hubble’s galaxy classification dates to the 1920s
2.He distinguished ellipticals, spirals and irregulars
3.The old term “spiral nebulae” was replaced
YouTube Angle
Suggested video title for this topic:
"How astronomers learned that galaxies come in different shapes"
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