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Articles on Time travel

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Gravity feels like it’s pulling everything toward Earth, but why? AdventurePhoto/E+ via WikimediaCommons

Why does gravity pull us down and not up?

Gravity is something every person on Earth intuitively understands: It is what keeps you on the ground. But how come gravity pulls down, rather than pushes up? Einstein came up with the answer.
Feel like traveling to another dimension? Better choose your black hole wisely. Vadim Sadovski/Shutterstock.com

Rotating black holes may serve as gentle portals for hyperspace travel

Feel like visiting another star system or dimension? You can do this by traveling through a spacetime portal of a black hole. But you better choose carefully. All black holes are not created equal.
Still from Back to the Future, 1985.

The great movie scenes: Back to the Future

Back to the Future is one of the most loved films from the 1980s, and galvanised audiences across every demographic. In this episode of Close-Up, Bruce Isaacs looks at the politics underpinning the film.
Dr. Who used the this time machine, called the TARDIS, to travel through space and time on the BBC television show Dr. Who. Babbel1996 / Wikimedia Commons

Time travel is possible – but only if you have an object with infinite mass

Who wouldn’t want to travel in time, glimpsing the dinosaurs or peeking at humans 2,000 years from now? Now physicists have designed a time machine that seems deceptively simple.
Doc (Christopher Lloyd) and Marty (Michael J Fox) in 2015. Universal Studios

It’s Back to the Future Day today – so what are the next future predictions?

The movie got some predictions right on what Doc and Marty would find when the arrive in the “future” today. But what could they find if they took another 30 year leap into the future?

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