Thursday, July 11, 2013
In
the mid-1800s, astronomy faced a serious problem. No one knew how the
stars shone. Now a little mystery never hurt anyone, but in this case
it was deeply perplexing. By this time we had a solid understanding of
energy, and that energy is conserved. That is, energy must come from
somewhere, and it
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In Medieval Europe, the physical universe could be divided into two parts: the Earth and earthly events (chaotic and temporary) and the heavens (structured and eternal). That's a bit of an over simplification, but the idea was that the Earth and heavens were governed by different rules. In the heavens the stars were fixed and eternal. The motion of the planets were thought to move in
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At the end of the 1800s we finally knew how the universe worked. Newton’s laws of motion and gravity had been studied for 200 years, and had become the pinnacle of scientific precision. James Clerk Maxwell had unified the electricity, magnetism and light into a single elegant theory, and
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Wednesday, July 10, 2013
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