Question: Do you know about time travel and alternate dimensions? Thanks

Helen Johnson answered on 19 Nov 2014:

We think that time can only ever run forwards 🙁 Your time can slow down compared to other people’s if you are moving really close to the speed of light, or if you’re really close to a black hole/in some very strong gravitational field, but don’t think it can ever go backwards. In theory, if you were on Earth and someone was up in Space near a black hole with a huge, huge clock that you could see with a telescope – their clock would appear to be ticking slowly. I love the idea of time travel though.. it’s definitely great for movies! Have you seen Back to the Future?