However, going back in time goes against the laws of physics- some processes are reversible and some irreversible.

Processes like an avalanche can’t unhappen. Likewise, on a smaller scale, if you drop an egg, you can’t unbreak it.

A spinning top or a pendulum, is reversible because it keeps moving, repeating itself. Nothing really happens. “Within physics, we’re very aware of these issues. The world is irreversible. And so are our lives. We grow, we age, we die,” says Dr Steane.

You can’t reverse the effects of a catastrophic event. And that’s why going back in time is not likely to be possible.