Motivated by the desire to increase public interest in spaceflight and to show the potential of people with disabilities , in 2007 he participated in zero-gravity flight in a `` Vomit Comet '' , courtesy of Zero Gravity Corporation , during which he experienced weightlessness eight times .
[ 297 ] Motivated by the desire to increase public interest in spaceflight and to show the potential of people with disabilities , in 2007 he participated in zero-gravity flight in a `` Vomit Comet '' , courtesy of Zero Gravity Corporation , during which he experienced weightlessness eight times .