Question

physicists generally agree that in theory time travel to the future is possible, but travel to the past is another matter. some speculate that the distance we can travel backwards through time may be limited. the moment the first time machine is activated may be the furthest into the past we can go. this would explain why we havent yet met any time travelers from the future. the first time machine has not been activated yet. assume someone activates a time machine tomorrow at breakfast. according to this hypothesis, how far could that person travel into the past? 1 the person could not travel back at all until some time had passed. 2 the person could travel back to the day he or she was born. 3 the person could never travel to the past, only to the future.

Explanation:

The hypothesis states the furthest into the past one can go is the moment the first time - machine is activated. If it's activated tomorrow at breakfast, no travel to past before that activation is possible.

Answer:

1. The person could not travel back at all until some time had passed.