How Far Away Is It - 01 - Preface (1080p)

Text at This is a video book of Hubble and other Space Telescope pictures together with an illustrated explanation of how we know how far away things are - from your back yard to the most distant galaxies. See how: triangulation can take us across the globe parallax can take us across the solar system standard candles can take us across the Milky Way red-shift can take us across the universe. The video book contains three chapters: Solar System; Milky W