What did Herschel hypothesize about many of the fuzzy patches known as nebulae?

Answer

They were distant star systems, or galaxies outside our own

Herschel proposed that many nebulae were actually remote star systems, which are now understood as galaxies outside the Milky Way.

What did Herschel hypothesize about many of the fuzzy patches known as nebulae?

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Sir William Herschel -- "The King's Astronomer" | David Rives

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