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Biology
Kian Newton
3 March, 12:22
How is light used to study space?
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Giancarlo Farrell
3 March, 16:11
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We use the speed of light to calculate how far apart the stars are, and to estimate the size and age of the universe. Speed-of-light calculations are what confirmed that the universe is expanding. And because light takes a certain amount of time to get here, when we look at the stars, we're literally looking back in time, to what the universe was like millions of years ago
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