Jelaskan {{cite journal dari Anjakan merah dalam bahasa melayu

|title=A Relation between Distance and Radial Velocity among Extra-Galactic Nebulae

|journal=Proceedings of the National Academy of Sciences of the United States of America |volume=15 |issue=3 |pages=168–173

}}</ref> Pemantauan ini menyokong kerja Alexander Friedman 1922, dari mana dia menghasilkan persamaan Friedmann yang terkenal. They are today considered strong evidence for an expanding universe and the Big Bang theory.