Author: duffieldjohn

Science on Sunday with John Duffield: Dark Matter

The evidence for dark matter is provided by flat galactic rotation curves, the orbital motion of galaxies in clusters, and gravitational lensing, such as that of the Bullet Cluster: There’s just not enough visible matter to account for all the gravity. Strictly speaking this might be because gravity doesn’t quite work the way people think,

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Science on Sunday with John Duffield: Gravity

The thing about physics is that once you understand one thing, it’s easy to understand another. A couple of weeks back I was talking about time being derived from motion. Once you understand that, it’s easy to understand that the speed of light isn’t constant. Then once you understand that, it’s easy to understand gravity.

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