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Black and white photo of Fritz Zwicky. He wears dark pants and a white, button down shirt. A tank top undershirt is visible underneath. His right hand is on his hip and his left hand is held up, making an “o” shape with his thumb and index finger. Zwicky, who appears to be in his 60s in this photo, is making a funny, frowning face, like he smelled something bad. He is also wearing a bolo tie, which is a point in his favor.

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Black and white photo of Fritz Zwicky. He wears dark pants and a white, button down shirt. A tank top undershirt is visible underneath. His right hand is on his hip and his left hand is held up, making an “o” shape with his thumb and index finger. Zwicky, who appears to be in his 60s in this photo, is making a funny, frowning face, like he smelled something bad. He is also wearing a bolo tie, which is a point in his favor.
https://files.mastodon.social/media_attachments/files/110/764/969/296/005/192/original/5ecb52d7534e236f.jpeg

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Robert McNees (mcnees@mastodon.social)'s status on Sunday, 23-Jul-2023 19:08:27 UTC Robert McNees
in reply to

The modern case for dark matter began with Fritz Zwicky in the 1930s.
His observations of galaxies in the Coma Cluster suggested there simply wasn't enough luminous matter present to gravitationally hold everything together. Hence, there must be matter there that you can't see!

In conversation Sunday, 23-Jul-2023 19:08:27 UTC from mastodon.social permalink