Science Weblecture for Unit 64
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Discoveries in the twentieth century have led astronomers to the conclusion that space itself is expanding as the result of a primordial "Big Bang". The evidence for the initial expansion lies in a faint background radiation. But whether this expansion can continue indefinitely depends on a number of factors, including how fast the universe is expanding now, and how much matter there is in the universe — questions for which we don't know the answer!
Read Nick Stroebel's summary of "Cosmology", through the section on Cosmic Microwave Background Radiation (three pages, not counting the section review). You can read further if you like!
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