How Old Is It - 01 - Preface

Text at Hello, and welcome to our video book on ‘How old is it’. This is our 4th video book. The other 3 all started here in my back yard. The first one was ‘How far away is it’, where we started with direct measurements and triangulation in the backyard, and took it across the earth, the solar system, the galaxy, the Virgo supercluster out to the farthest reaches of space. Our second video book was ‘How small is it’. We started here with a strand of hair; took it to the microscopic; all the way down to the tiniest elementary particles; Quantum Mechanics; the standard model of particle physics; and the Higgs boson. Our third video book was ‘How fast is it’, where we started here with a snail moving across the tile. And took it to the speed of light; special relativity; general relativity; and gravitational waves. For this video book we’re not going to start in the backyard. We’re going to start at the cosmos – the very beginning of the expansion of the Universe. And over