Is time travel possible, according to science?
Ethan Siegel

Great write-up. I knew that traveling to the future was much easier than traveling to the past. However, I always thought that, according to General Relativity, there is nothing in the laws of physics to prevent time travel, but it would require tremendous amounts of power. Still, the idea of traveling back in time is compelling, but just from watching the Back to the Future trilogy, far too dangerous.