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How Big is Space?
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When you’re out at night with an astronomer, you’ll hear statements like ‘that planet is 500 million miles away’, or ‘that star is 1800 light years from Earth.’ Yet all the stars and planets look just like points of light stuck to the inside of a big dome. How can astronomers measure their distances, and how do they cope with the enormou snumbers involved?
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This event was on Fri, 17 Nov 1995
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