![From Wine Glass to Gravitational Lensing thumbnail](https://opn-web-afd-d3bfbkd5bcc5asbs.z02.azurefd.net/opn/media/images/imageoftheweek/2020/20-12-28.jpg?t=638430740312825969)
From Wine Glass to Gravitational Lensing
The foot of a wine glass, as used in a demonstration to understand the optics of the relativistic effects of gravitational lenses. From the paper “Halo Dynamics: From Rainbows to Black Holes.”
—Alberto Tufaile, Universidade de Sao Paulo, Brazil