Download or read book Lightspeed written by John C. H. Spence and published by . This book was released on 2020 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book tells the story of one of man's greatest intellectual adventures - how it came to be understood that light travels at a finite speed, so that when we look up at the stars we are looking back in time. From the ancient Greeks measuring the distance to the sun, to today's satellite navigation, the book offers a gripping historical journey.