General Relativity Says Were Wormholes Possible?

According to our understanding of general relativity you can do things like build wormholes. A wormhole would allow you to travel into the future or also into the past. There's another wrinkle in general relativity that allows this they're called closed time-like curves. These are theoretical nobody's ever observed these and most physicists think that they probably represent the breakdown of general relativity not an actual prediction for what would be possible in our universe.