The giant-impact model suggests that at some point in Earth's very early history, these two bodies collided. During this massive collision, nearly all of Earth and Theia melted and reformed as one body, with a small part of the new mass spinning off to become the Moon as we know it. | The Science of Universe

297K views · 3.4K reactions | On #ThisDayinHistory* 1918, the Romanov family is executed ending an imperial dynasty that had ruled Russia for over 300 years. #Romanov100 *The historical debate places the dates as late night on the 16th through early on the 17th* | HISTORY | Facebook