Gravity and Orbits is an interactive simulation that investigates the effect of gravity on orbital paths. Users are given the option of investigating four scenarios: 1. star and planet, 2. star, planet and moon, 3. planet and moon, and, finally, 4. planet and satellite. In each case, users can change the size of the objects and the distance between them. Users can also elect to switch gravity on or off. Two screen choices, a Cartoon or a To Scale version, are offered for each scenario. Several documents are available for downloading: a 5 page FAQ for teachers (listed as Teacher Tips), a TeacherNotes file, a lesson plan and a 39 page scripted Teacher's manual produced by UTeach Outreach at The University of Texas at Austin. The TeacherNotes file can be downloaded at: http://phet.colorado.edu/en/contributions/view/3401. The lesson plan and manual, which are organized around 5-E and include an introductory activity, probing questions, student responses and potential misconceptions, are available at: http://phet.colorado.edu/en/contributions/view/3566. In addition, several teacher-submitted activities designed to support the middle school classroom are available.