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You are in charge of designing a new telescope to map far away stars. Given that...

You are in charge of designing a new telescope to map far away stars. Given that our galaxy is 10^5 light years across and most stars are ? 10 light years apart (a) what diameter aperture do you need for mapping these stars? (Assume that you are using visible light, (b) How large would the aperture have to be to distinguish binary stars (only 10^(-7) ly apart)?

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