Solar Nebula Secret: 4 Billion Years Ago Uranus And Neptune Switched Places
Four billion years ago, says Steve Desch, assistant professor in the School of Earth and Space Exploration at Arizona State University, Uranus and Neptune switched places. His research work appears in this week’s Astrophysical Journal. Desch based his conclusion on his calculations of the surface density of the solar nebula.
United States Steve Desch Space Exploration At Arizona State University School Of Earth Space Exploration Arizona State University
Source: science20.com