The Short Answer: Although humans can’t hop into a time machine and go back in time, we do know that clocks on airplanes and satellites travel at a different speed than those on Earth. And we are all traveling in time at approximately the same speed: 1 second per second.

88 miles per hour

A DeLorean can reach at least 150 mph, but White said his vehicle “was perfectly happy” doing 88 mph. Although the original John DeLorean sports car does not have all the bells and whistles added by Doc Brown in the hit film, White’s DeLorean did come with a faux flux capacitor installed by a previous owner.

We’re inevitably moving 1 second at a time into the future, and we could go faster if we wanted. “Indeed, we can jump forward into the future as much as we want. It’s only a matter of going really, really fast,” Paul Sutter, an astrophysicist at Ohio State University, told Space.com in an email.

Precognition (from the Latin prae-, “before” and cognitio, “acquiring knowledge”), also called prescience, future vision, or future sight, is a claimed psychic ability to see events in the future. Precognition also appears to violate the principle of causality, that an effect cannot occur before its cause.

Wormholes connect two points in spacetime, which means that they would in principle allow travel in time, as well as in space.

Time feels real to people. But it doesn’t even exist, according to quantum physics. “There is no time variable in the fundamental equations that describe the world,” theoretical physicist Carlo Rovelli tells Quartz.

These black holes are dark most of the time, but when their gravity pulls in nearby stars and gas, they flare into intense activity and pump out a huge amount of radiation. Massive black holes are dangerous in two ways. And if they are in their active quasar phase, you’ll be blasted by high-energy radiation.