We've only known that other galaxies exist as entities unto themselves for a century — we used to think they were small and inside our Milky Way!
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We've only known that other galaxies exist as entities unto themselves for a century — we used to think they were small and inside our Milky Way! But the obsolete terminology stuck around a long time after we figured that out.
We Had a Name for ‘Galaxies’ before We Knew They Existed
Centuries before other galaxies were known to exist, astronomers called them “spiral nebulas.” Today the defunct term still sparks confusion
Scientific American (www.scientificamerican.com)
