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Showing posts from August, 2018

Stars in universe greater or the sand grains in the world deserts?

Stars in the Universe?  Which Is Greater, the Number of Sand Grains in the world's deserts and beaches, Or stars in the universe?                   Here's an old question— which are there more grains of sand in the world's deserts and beaches, or stars in the Universe? American astrophysicist Carl Edward Sagan had told that there are much more and more stars in the universe than the sand grains in the world's deserts and beaches. Is he right in his claim? Can the stars in the Universe be counted?                                                                           Obviously, grains and stars can't be counted, but you can estimate. Being well-versed in all these things, Gerry Gilmore , professor of astronomy at Cambridge University, tried to calculate the number of stars in our galaxy. He said about 2 trillion stars are there in just our galaxy considering the distance, size and the light they reflect as the factors. Rather than counting