Cambridge University Library is celebrating its 600th anniversary with an exhibition of priceless treasures communicating 4,000 years of human thought. To celebrate, we have made six films on the six distinct themes featured in Lines of Thought. The second film in the series looks at Gravity; by following the discussions of generations of great scientific minds, from Copernicus to Hawking via Newton and Einstein, we begin to understand our place among the stars. To see more of the exhibits in this theme, visit the Virtual Exhibition: https://exhibitions.lib.cam.ac.uk/linesofthought/case/gravity/