who proposed Big Bang theory and where
Answers
Explanation:
Georges Lemaître
In 1927, the Belgian Catholic priest Georges Lemaître proposed an expanding model for the universe to explain the observed redshifts of spiral nebulae, and calculated the Hubble law. He based his theory on the work of Einstein and De Sitter, and independently derived Friedmann's equations for an expanding universe.
Explanation:
In 1916 Einstein published his theory of general relativity. With this he also proposed a theoretical model of Universe (which was not expanding). Then in 1927 Georges Lemaitre proposed the big bang theoretical model of the expanding universe. In around 1930 astronomer Edwin Hubble found that all galaxies were flying away from each other in all directions. So scientists conjectured that in distant past (13.8 billion years ago) all the matter of the universe was confined to a single point called Singularity which exploded with a big bang. Then George Gammow and other scientists predicted hot big bang. They calculated the temperature of the cooled universe at present time. This was experimentally verified by Wilson and Penzias to be 2.7 degree Kelvin. This established the big bang theory as a viable theory.
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