If we discover time travel, what kind will it be?

Prediction market on manifold. If we discover time travel by market close (2100) or earlier, resolves to the option that best describes the mechanics of time travel. If we do not discover time travel by market close, resolves N/A. Information-only time travel and short-duration time travel count, but time-dilation/forward-only time travel don't. If we observe time travel (to a high degree of proof) but can't necessarily replicate it on demand, that counts too. See: https://www.thegeektwins.com/2013/03/3-most-common-types-of-time-travel-in.html

Liquidity: $1,000. Resolves: 1/2/2100.