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268 points wglb | 1 comments | | HN request time: 0.241s | source
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bparsons ◴[] No.42158887[source]
If the lens curved light back toward us, could we see earth several million years ago?
replies(4): >>42158948 #>>42159200 #>>42160335 #>>42164234 #
1. dtgriscom ◴[] No.42164234[source]
I believe this could only happen around a black hole. In that case, yes: light that we emitted umpty-million years ago could be shot back at us. The problem is that there would be no focussing. At best it would be like looking at an Earth 2 x umpty-million light years away. I'm guessing that it would actually be worse, with the black hole dispersing light.

(IANAastronomer, but I have opinions on any given topic...)