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Download full textSingh, Satya Pal; Singh, Apoorva; Hareet, Prabhav – European Journal of Physics Education, 2011
The progress of modern cosmology took off in 1917 when A. Einstein published his paper on general theory of relativity extending his work of special theory of relativity (1905). In 1922 Alexander Friedmann constructed a mathematical model for expanding Universe that had a big bang in remote past. The experimental evidences could come in 1929 by…
Descriptors: Physics, Scientific Concepts, Theories, Scientific Principles
