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The fate of the universe

One of the things cosmologists like to talk about is the fate of the universe. Some say it all depends on the density parameter omega: Ω. This started life as…

Inflation

The theory of cosmic or cosmological inflation is related to Big Bang theory. It’s been around now for the thick end of forty years. Or more. By 1980 a lot…

Dark matter

There’s plenty of evidence for dark matter, ranging from velocity dispersion, flat galactic rotation curves, and gravitational lensing. The evidence for dark matter is so good we can even map…

The information paradox

The information paradox was first mooted by Stephen Hawking in 1976. For an introduction to the subject, see Brian Koberlein’s black holes tell no tales or do they? Then see…

The proton

If you look around the internet you can find articles like Matt Strassler’s what's a proton anyway? He says the proton isn’t made up of three quarks joined together by…

Yes, there's a hole in the heart of quantum electrodynamics because it describes the interaction between light and matter, but not the interaction between light and light. That's the interaction that…

All articles

The future isn’t what it used to be A detective story The nature of time The speed of light is not constant How gravity works The principle of equivalence and…