Feature: Cinema, fact and fiction. We take a look at why it continues to fascinate us. Image: Michel Gilgen. Science fiction offers humankind worlds in which everything is theoretically possible — worlds where we can peer into the future, and also adapt our past to make it suit our desires. In fact, all we need to travel in time is to look at the starry sky, where we can gaze millions of years into the past, as far back as light itself needs to travel from distant galaxies to us on Earth.
When we move at high speed, or are exposed to strong gravitational forces, time passes more slowly, relative to everything else. This elasticity of time is one of four categories of time travel described by the physics YouTuber Henry Reich.
They cannot change the past, which means that no time paradox arises. In the process, he even manages to make them both cooler than they were before. In theory at least, this kind of time travel could be possible. Another possibility that has been a subject of much discussion is wormholes — a kind of tunnel that could connect two different places and different times in the Universe.
Wormholes are theoretically possible in physics, but no one has ever observed one. In order for such a distortion of space-time to be possible, we would somewhere have to discover exotic matter that possesses negative mass. However, no research is being undertaken anywhere into the time travel of particles, he says. And when we postulate a hypothetical, far-off future, it offers us the necessary critical distance for us to take a hard look at our present times.
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