大象传媒

The doctors investigate a millennia-old query, as listener Emma in New Zealand asks:

鈥楬ow does gravity pull us?鈥�

People have been thinking about how gravity works for a very long time. Way longer than when that particular apple almost certainly didn鈥檛 fall on the head of Isaac Newton. Cosmologist Andrew Pontzen begins guiding us through our journey by taking us back to the almost entirely incorrect writings of ancient Greeks.

We then fast forward past Galileo and Newton, and throw in an extra dimension. Using an all-too-believable analogy where some merry cyclists suddenly ride into a meteor crater, astrophysicist Katy Clough tells us how Einstein鈥檚 spacetime works.

Limitations of analogies accepted, this explains some of the observations that didn鈥檛 fit with Newton鈥檚 workings alone. But there are other snags with our understanding of gravity, both at the very small quantum scale and the very large galactic scale. Physicist Chamkaur Ghag introduces what scientists think may account for some of these issues: the mysterious dark matter.

Presenters: Hannah Fry & Adam Rutherford

Producer: Jen Whyntie

A 大象传媒 Audio Science Unit production for 大象传媒 Radio 4, first broadcast in February 2019.