The Rensselaer Astrophysical Society (RAS) allows students to pursue their interest in astronomy. The society works in conjunction with the physics department to maintain the Hirsch Observatory atop the Science Center. Students are trained in the use of observatory and the Society's various telescopes, then placed on the observatory key list. Once on the key list, members can use the observatory at any time. The club also helps run Saturday night public observing sessions between February and November of each year.