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Edwin Powell Hubble, the American astronomer, demonstrated the existence of other galaxies besides the Milky Way.

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Who showed that other galaxies existed and observed that the universe was expanding?

Edwin hubble >:d


How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?

The energy of the cosmic microwave background is about 400,000 times less than the energy of all the stars and galaxies that ever existed. The CMB is the remnant radiation from the early universe, while the energy radiated by stars and galaxies have been accumulating over millions of years.


How is it possible that the universe could have existed for an infinite amount of time in the same state if galaxies are continuously receding from each other?

The universe has not existed in the same state for an infinite amount of time, that would be the steady state theory, which has been replaced by the big bang theory. The galaxies are moving away from each other because the universe is expanding at an increasing rate. It has been expanding since the big bang happened 13.7 billion years ago.


The scientist who proved the existence of galaxies other than the Milky Way was who?

Mister Edwin Hubble did just that, before the 1920's, many astronomers thought that our galaxy included everyobject in space, in 1924 Edwin Hubble proved that other galaxies existed beyond the milky way


Edwin Hubble demonstrated that distant galaxies existed by measuring which type of stars?

Edwin Hubble used Cepheid variable stars to measure the distances to galaxies. These stars have a relationship between their luminosity and pulsation period, allowing astronomers to calculate their distance based on their observed brightness.