http://researchstories.asu.edu/taxonomy/term/232 The taxonomy view with a depth of 0. en http://researchstories.asu.edu/2008/01/solar_system_swap_uranus_and_n.html <p>Quick: What's the order of the planets in the solar system? It's Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, right? That's right today. But four billion years ago, Uranus and Neptune switched places. How do we know? With the help of a very Nice model, for starters. <em>--by Nikki Staab</em></p><p><a href="http://researchstories.asu.edu/2008/01/solar_system_swap_uranus_and_n.html">read more</a></p> http://researchstories.asu.edu/2008/01/solar_system_swap_uranus_and_n.html#comments ASU Insight Nikki Staab Steve Desch Tempe campus Physical Sciences and Mathematics Space Studies Thu, 24 Jan 2008 12:17:37 -0700 pkrecker 842 at http://researchstories.asu.edu