2.) Every galaxy in the visible Universe would still be reachable. In our dark-energy dominated Universe, the rate a distant galaxy recedes from us increases as time goes on. Galaxies presently more than 15 billion light years away are receding faster than the speed of light, and so nothing leaving Earth today — not a relativistic spaceship, not a deep-space probe, not even light itself — could ever reach it. Already, 97% of the galaxies in our Universe are forever beyond our reach. But if we were to take that dark energy away, everything would be reachable eventually, even if it took tens or hundreds of billions of years. We’d get there in the end.