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 dilation
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Cosmology does not need dark matter or dark energy in an expanding universe that allows the constants of nature to evolve, and light loses energy as it travels vast distances.
Bright, flickering galaxies called quasars were thought to pose a problem for our understanding of the cosmos – but new research shows Einstein was right yet again.
Your experience of time is relative because it depends on motion – more specifically, your speed and acceleration.
Black holes could take us to the future, and maybe even the past. The hard part would be surviving the trip.
Time dilation might seem like science fiction, but it’s not. There are astronauts circling the Earth right now who are experiencing it – though luckily nowhere near as much as Buzz Lightyear.
A different interpretation of time might explain why people see their whole lives replayed to them in a split second.
Jets from supermassive black holes behave in mysterious ways. Now scientists have now worked out what’s really going on.
Forget about anti-ageing creams and hair treatments. If you want to stay young, get a fast spaceship. That is what Einstein’s Theory of Relativity predicted a century ago, and it is commonly known as “twin…
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Professor, Philosophy of Science, The University of Melbourne
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Adjunct professor, Physics, L’Université d’Ottawa/University of Ottawa
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Assistant Professor of Applied Mathematics, Durham University
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Senior Lecturer in Psychology, Leeds Beckett University
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Research Scientist, SETI Institute
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Professor of Astrophysics, University of Sydney
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Postdoctoral Researcher, University of Nottingham
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Project Scientist, University of California, San Diego