Lunar and Planetary Laboratory - http://www.lpl.arizona.edu University of Arizona - http://www.arizona.edu Southwest Meteorite Laboratory - http://www.meteoritelab.com NAI: NASA Astrobiology Institute - http://astrobiology.nasa.gov/nai/ NASA: National Aeronautics and Space Administration - http://www.nasa.gov An artist's impression of a massive asteroid belt in orbit around a star the same age and size as our Sun. Image credit: NASA/JPL-Caltech.