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General Relativity

Analysis and Comment (7)

Doesn’t matter if it doesn’t work. andertoons

How to test the twin paradox without using a spaceship

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…
When you’re celebrating the New Year, be sure to spare a thought for Vesto Slipher and the birth of cosmology. Nuwandalice

Expand into 2013 by toasting 100 years of modern cosmology

As 2012 comes to a close and you toast the New Year, be sure to also raise a glass to one Vesto Melvin Slipher. My intent is to describe what Slipher did 100 years ago in Flagstaff, Arizona and why this…
Hyper-drives might be the stuff of science fiction, but they could be science fact too. 20th Century Fox

Warp drives and reality: new hope for a Galactic Empire?

Fans of science fiction must be disheartened when introduced to Einstein’s Special Theory of Relativity. Dreams of galactic empires, criss-crossed by roguish princesses and beautiful smugglers, go out…
The universe teems with energy and matter we don’t understand. stuant63/Flickr

Adventures in the dark side of cosmology

In questioning the fundamental nature of the universe, cosmology regularly grabs the public’s attention. But in an era in which we are observing deeper and more widely than ever before, our knowledge of…
Time travel has long been a staple of science fiction but the LHC might make it a reality. Fabrice Coffrini/AFP

Is the Large Hadron Collider a time machine?

Switzerland’s Large Hadron Collider (LHC) can be called a time machine in one sense: it enables us to examine conditions as they were during the universe’s early stages. But is the 27km-long particle accelerator…