Easy 10 points. Cant find these answers anywhere.
1) How does the motion of the milky way and other galaxies tell us that there must be a great deal of dark matter in galaxies?
2)How do variable stars allow us to measure the distance to other galaxies?
Looked all through my text book.
Help appreciated. Thanks
1) How does the motion of the milky way and other galaxies tell us that there must be a great deal of dark matter in galaxies?
2)How do variable stars allow us to measure the distance to other galaxies?
Looked all through my text book.
Help appreciated. Thanks
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1) Look up rotation curves of galaxies.
2) Look up Cepheid variables.
2) Look up Cepheid variables.
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1) The Milky Way rotates like an old fashioned phonograph on a record player turntable does, like a solid disk. There has to be a LOT more mass in the Milky Way for it to rotate like a solid object. I remember reading papers in the 1960's in Scientific American by scientists who couldn't figure out why the Milky Way rotates this way. It took a long time before they realized that Frank Zwicky was correct in 1934
2) Do what eri says. She has a Ph.D. degree; I only have an M.S. in geology.
2) Do what eri says. She has a Ph.D. degree; I only have an M.S. in geology.