Sphere

by Michael Crichton

I think we already have evidence that we will forget about it. That solves a logical problem that bothered me from the beginning, when we first explored the ship. Because something very important was missing from that ship.” “Yes? What?” “Any sign that the builders of the ship already knew travel through a black hole was possible.” “I don’t follow you,” Norman said. “Well,” Harry said, “the three of us have already seen a spaceship that has been through a black hole. We’ve walked through it. So we know that such travel is possible.” “Yes …” “Yet, fifty years from now, men are going to build that ship in a very tentative, experimental way, with apparently no knowledge that the ship has already been found, fifty years in their past. There is no sign on the ship that the builders already know of its existence in the past.”