a body that revolves around another body in space. it has 9 letters
Google provides many answers.
http://www.google.com/#sclient=psy&hl=en&authuser=0&source=hp&q=body+that+revolves+around+another+body+in+space&pbx=1&oq=body+that+revolves+around+another+body+in+space&aq=f&aqi=g-v1&aql=&gs_sm=e&gs_upl=42063l42063l0l1l1l0l0l0l0l150l150l0.1l1&bav=on.2,or.r_gc.r_pw.&fp=cd6248f9e4a29d1b&biw=853&bih=534