Amateur astronomers and volunteer (citizen) scientists discovered most of the known planets and comets, and they continue to make major contributions to planetary science research. . NASA planetary citizen science projects, open to anyone around the world, encourage volunteers to join research projects exploring the origins and composition of our solar system. Learn more below about how to participate in or start a project. Our products -- almanacs, software, and web services -- provide precise astronomical data for practical applications, serving the defense, scientific, commercial, and civilian communities. [11] The system formed about 4. Contribute to CivilianAstrophysicist/solarsystemmodel development by creating an account on GitHub. Through the projects below, sometimes called "citizen science" or "participatory science" projects, volunteers. . Johns Hopkins APL's Civil Space Flight Mission Area delivers critical spaceflight hardware to NASA, international partners, and other U.