Time travel has long-been invoked in works of science fiction. But how close is it to becoming a reality?
Astrophysicist Stephen Hawking recently revealed his latest project, the Breakthrough Starshot, in which a group of tiny spacecrafts using laser technology will be sent toward Alpha Centauri (the closest star system to ours) at a speed of 100 million miles per hour.
Before Starshot, that trip would take around 20,000 years to complete, but Hawking claims that his revolutionarily fast vessels would be able to make the journey in just 20.
That sounds like a much more manageable time frame — but what if time was no obstacle at all? We’ve already made time travel a reality in movies and novels. But how far are we from that sci-fi future?