Apollo astronauts brought home nearly 850 pounds of rocks and soil from the moon. Those samples forced scientists to throw out much of what they thought they knew about the moon, and the collection continues to be a staple of lunar research. “They tend to be rocks very similar to Earth rocks, shockingly enough,” Samuel Lawrence, lead scientist for lunar exploration at NASA's Johnson Space Center. “That makes sense, when you think about it, because the earth and moon were formed at the same time