Marcus Chown is an award-winning science writer and broadcaster. Formerly a radio astronomer at the California Institute of Technology in Pasadena, he is now cosmology consultant for the New Scientist. His acclaimed books include What a Wonderful World, Quantum Theory Cannot Hurt You, We Need to Talk about Kelvin and The Ascent of Gravity ( Sunday Times Science Book of the Year 2017). He is also the author of Solar System for iPad, which won The Bookseller 2011 Digital Innovation of the Year. www.marcuschown.com @marcuschown