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Sounds like if you had just done even the most cursory internet search, you’d have found these are all topics that are being researched by astrophysicists. Don’t choke on your overflowing cup of snark.

Wormholes, quantum entanglement, and warp drives all fit the theory of relativity. An alien could send robots as a proxy or have figured out how to slow down or stop aging. Add that to the growing science of inter-dimensional travel and you’ve got plenty of starting points.