Where did our Moon come from? Over the years, there have been several theories — but the one most scientists agree on is a collision theory. It’s likely that a Mars-sized object smashed into the Earth, creating what we now see in the night sky. ⁣ ⁣ NASA scientist Caitlin Ahrens shines a light on the Moon's mysterious origins: http://solarsystem.nasa.gov/moons/earths-moon⁣ ⁣ ⁣Producers: Jessica Wilde, Scott Bednar⁣ Editor: Matthew Schara ⁣ ⁣ ⁣ Credit: NASA | NASA - National Aeronautics and Space