HOUSTON - Petty Officer 3rd Class Stephen Cantu, an avionics electrical technician with Air Station Houston, experiences weightlessness for the first time aboard a NASA-contracted Zero-G plane, approximately 30,000 feet above the Gulf of Mexico, Aug. 21, 2012.The Zero-G plane is a modified Boeing 727-200 that was contacted by NASA to perform microgravity services that simulate weightlessness or reduced-gravity conditions for the passengers and payloads. U.S. Coast Guard photo by Petty Officer 3rd Class Richard Brahm.