From Stephen Robinson
In discussing gravitational waves (22 March, p 8), Lisa Grossman quotes Alan Guth of MIT as saying “Inflation depends on a kind of material that turns gravity on its head and causes it to be repulsive.” Could this be cavorite, the material dreamed up by H. G. Wells, which astronauts used to propel their spaceship in his 1901 science fiction classic, The First Men in the Moon?
London, UK
