The earth and moon have the same water. This has implications for how we think not only the two formed but the solar system itself formed. One possible explanation involves Jupiter making a trip into the inner solar system. _Scientific American_ has [the story](http://www.scientificamerican.com/article.cfm?id=earth-and-moon-got-water-from-common-source).
(Visited 3 times, 1 visits today)