US EditionHow did Edwin Hubble prove Andromeda was a galaxy?
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How did Edwin Hubble prove Andromeda was a galaxy?
How did a Cepheid variable star help Edwin Hubble prove the Andromeda Nebula was a galaxy? Roger BradySan Quentin, California Cepheids are rare variable stars with periods ranging from about 1 to 120 days. Their light curve — a chart showing brightness over time — is characterized by rapid brightening followed by slow dimming inContinue reading "How did Edwin Hubble prove Andromeda was a galaxy?" The post How did Edwin Hubble prove Andromeda wa…
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