Astrophysicist Ethan Siegel offers two scenarios where it wouldn’t: The second way out is to assume that the past isn’t written, and your actions do matter. The Universe, as it exists today, is not bound to the state its in right now if you travel back to the past. In a way, every action you […]
Tag: time travel
Astrobiologist: Why time travel can’t really work
Recently, cosmologist Carlo Rovelli, author of The Order of Time, argued that time travel, especially into the future, can work. However, astrobiologist Caleb A. Scarf sees an insurmountable barrier, which he calls the “spatial problem”: Let’s take the Earth’s motion around the Sun. A month of orbit corresponds to moving in an arc of approximately […]
Cosmologist Carlo Rovelli: Future time travel only a technological problem
Not a scientific one. Dan Falk interviews physicist Carlo Rovelli about “about the nature of time, whether it has a beginning and if humans might one day master time travel:” Could time travel ever be possible? Well, “time traveling” is what we do all our lives, isn’t it? But you mean, can we jump quickly […]
At the BBC: Still working on that ol’ time machine…
From the BBC: Albert Einstein thought the three dimensions of space were linked to time – which serves as a fourth dimension. He called this system space-time, and it’s the model of the Universe that we use today. But Einstein also thought it was possible to fold space-time, creating a shortcut between two distant locations. […]