NASA scientist Jen Heldmann describes how the Earth’s moon was formed
NASA scientist Jennifer Heldmann describes the most popular theory of how the solar system and Earth’s moon was formed. Below you can watch a short four minute video of her explanation of the accretion theory, see a computer simulation of the hypothesis, or watch the whole 45 minute video as recorded during the “Ask a Scientist” event in San Francisco, CA, on Oct 7th, 2008.