Wormholes, dimensional gateways, and cosmic strings may exist naturally in outer space. At the instant of the big bang, when there was a huge amount of energy released into the universe, wormholes and cosmic strings may have formed naturally. The inflation of the early universe might then have expanded these wormholes to macroscopic size. In addition, there is the possibility that exotic matter or negative matter exists naturally in outer space. This would help enormously in any effort to leave a dying universe.
