Question: Do you think time traveling is possible??

Stewart Martin-Haugh answered on 12 Nov 2018:

I don’t know, but it seems unlikely. It’s fun to think about – I like any kind of book, series or film about time travel, as long as it takes it seriously.

One practical problem is that the Earth is travelling at 390 kilometers per second. So if you did go back in time, you would end up somewhere random in nearby space, rather than where you were on Earth at an earlier time. What you would need is a time + space machine.

The laws of physics seem to work perfectly fine forwards and backwards. I can just put a minus sign into equations and run them backwards: the answers all work fine. There are a couple of exceptions that I don’t need to go into here. The laws of physics also treat space and time in a similar way. We know we can go North/South East/West up/down very easily, but we can’t go forwards or backwards in time. Is this just a problem of how we experience the world, or is it something fundamental about how time works?

We know there are more laws of physics that we don’t know, which might give us an answer. Or perhaps not! Only one way to find out.