GCSE Physics

Gravity & Galaxies

We all know that gravity is an attractive force, acting between all objects with mass. This must mean that all the galaxies throughout the Universe are attracted to each other.

Surely the Universe should be collapsing? It would mean this, but only if every galaxy in the Universe was originally stationary.

A few clever observations, and it turns out that not only are the galaxies not moving together, but they're doing the exact opposite - flying apart!

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