The expanding universe 0.0 / 5 ? PhysicsAstronomyGCSEEdexcel Created by: sharonn.0Created on: 21-04-22 22:23 what is a galaxy a cluster of a billion of stars, held together by gravity 1 of 6 what is the red shift the change in wavelength of a light from a distant star moving away from Earth 2 of 6 what is the big bang theory around 13.8 billion years, the whole Universe was a very small, extremely hot and dense region and continues to expand 3 of 6 how is red shift evidence for big bang further away the galaxy, the greater the red shift the further away the galaxy, the faster they are moving 4 of 6 how is cosmic background radiation evidence for big bang the CMBR is the remains of the thermal energy from the Big Bang, spread thinly across the whole Universe. 5 of 6 what is the steady state theory the universe always existed and the universe is expanding and constantly making matter 6 of 6
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