noncongruent t1_jdxowzx wrote
The problem is that in order to see past events, you need to get the telescope out there faster than the speed of light. A photon leaving the Earth travels at the speed of light, and since no known or suspected technology allows traveling faster than light, or for that matter even at the speed of light, it means that no matter how far away you put the telescope it'll always only be able to catch photons that left Earth after the telescope did.
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