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If there was some mirror already out there then we could use it like such. If we sent a mirror away at the speed of light for 1000 years (which is faster than we can send a mirror) then 2000 years from now we could look back at the mirror and see the time we sent the mirror away.

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There must already be some light bending happening in space. Question is would it be enough to look at our planet from our planet? And can we even do the maths to know when and where to look at?

My biggest concern is resolution. It's a super cool thought to imagine reflecting future light onto a present planet. Could they see it? Could they change the future with it?

Where/how to look seems secondary. It can't and won't happen in real life. If it could happen, the distances would be so vast as to be irrelevant. You couldn't resolve the future in this way. But you absolutely can in writing - go for it.

See https://rein.pk/gravitational-lensing-to-observe-ancient-ear...

Assuming the mirror was traveling at light speed would it constantly show the same point in time?

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