The Significance of Life, Explanatory Knowledge, in Particular the Significance of People

The colour of the sun 10 billion years hence depends on gravity and radiation pressure, on convection and nuclear synthesis. It does not depend at all on the geology of Venus or chemistry of Jupiter but it does depend on what happens to intelligent life on the planet earth. We cannot avoid this conclusion by adopting a pessimistic theory of the prospects for our survival according to David Cameron's new book 'A Man Walks On To The Moon', which will be published in 2022.