The speed of light is the fastest anything can travel. What happens to a photon from a galaxy 25 million light years away on its journey toward Earth?
Articles on Time travel
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Local writers, painters, musicians and philosophers have long been inspired by the Black cultural movement that pulls from the past to envision the future.
Scientists are trying to figure out if time travel is even theoretically possible. If it is, it looks like it would take a whole lot more knowledge and resources than humans have now to do it.
Black holes could take us to the future, and maybe even the past. The hard part would be surviving the trip.
An astrophysicist explains what wormholes are and how these theoretical space-time tunnels have popped up in the solutions to a set of decadesold equations.
Albert Einstein might have the answer.
Theories exploring the possibility of time travel rely on the existence of types of matter and energy that we do not understand yet.
There’s a special type of particle called a ‘tachyon’ which would have to travel faster than the speed of light. But here’s the hitch – we can’t prove tachyons even exist.
Scientifically speaking, for time travel to exist, so must parallel timelines. This theory addresses the paradoxes that arise when studying the possibility of time travel.
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.
Bending space into warp bubbles to travel faster than light may never be a reality, but distorting the flow of time just might be possible.
There are two types of time travel: going back in time and going forward in time. And remarkably, people can feel time at different rates - but usually don’t notice it.
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.
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.
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.
Despite his playful optimism, Hawking recognised that the undiscovered laws of physics may prevent time travel.
Whether booking in a colonoscopy or choosing where to buy coffee, your memory and ability to visualise future scenarios shape life’s most important decisions.
Simon John James and Richard Bower chat about differing conceptions of what it is to travel through time.
A philosophical assessment of the latest Star Trek films demonstrates their sophistication.
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A podcast on time: telling it, perceiving it, doing it and travelling through it.
Top contributors
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Professor, Philosophy of Science, The University of Melbourne
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Professor of Physics, University of Rhode Island
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Senior Lecturer in Philosophy, University of Edinburgh
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President of Wolfson College, University of Cambridge
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Honorary Research Associate, Centre for Time
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Professor of Electrical and Electronic Engineering and Deputy Dean Research at Faculty of Engineering and Information Technology, The University of Melbourne
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Professor, University of Sydney
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Former Academic Research Fellow, Khalifa University
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Senior Lecturer in Computer Science, University of Cambridge
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Reader in Cognitive Science, Cardiff University
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Senior Research Fellow and UKRI Future Leaders Fellow in the Particle Theory Group, Department of Physics and Astronomy, University of Manchester
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Professor of AI, Research Group Leader, UNSW
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Professor & Director, Hub for Apple Platform Innovation (HAPI), School of Computing Technologies, RMIT University
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Pro-vice-chancellor, Professor, University of Birmingham
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Professor in the Department of English Studies, Durham University