1. You were told that a Centauri is 4.3 light years away. How long does it take...
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1. You were told that a Centauri is 4.3 light years away. How long does it take light to reach Earth from a Centauri?
2. Scaling the Earth to the size of a pea, how far away would Pluto be?
3. How far away are the most distant galaxies yet observed and how long has the light taken to reach the Earth from them?
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