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The seductive and attractive idea of faster-than-light communication is apparently an impossibility in practise.
How about another seemingly impossible idea:
Find the exact distance from the Earth that the wavefront of a specific signal has reached in space (at the present moment in time), the wavefront of electromagnetic radiation (e.g. visible light) which is coming from a specific historical event occurring at a specific time in human history.
Then (very!) quickly station a telescope a little further from the Earth than the current radius of the sphere (centred on the Earth) that the light from the event has currently reached!
Then point this "ultra-ultra-high-resolution" telescope back at the Earth, just before the light from the "historical event of interest" reaches the location of the telescope which is x light years from the Earth.
Then use the telescope to view the historical event of interest, and find out if the historians are right about what happened!
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Me, personally, I think it would be cool to see Jesus walking on the water! (at least, if you do believe in miracles, you will find out whether or not your belief is justified. Or did the water somehow develop enough surface tension to support a human being?)
As an aficionado of medieval and "dark ages" and pagan history, I would also like to view some specific battles that occurred between mighty and war-hardened knights, and to view the little-known pre-Christian worship practices of Anglo-Saxon England.
It would also be interesting to see Neanderthal culture and technology, as actually practised by the Neanderthals!
I would also like to see the first metazoans that evolved on our planet, slithering in the primeval slime! ]]
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