 Science On a Sphere (SOS) at Fiske Planetarium will raise awareness and understanding of Earth system science for over 00,000 visitors per year, using student docents and newly-developed, tested pedagogy. SOS will enhance Fiske's ability to engage 0,000 university students and 00,000 K-00 students and members of the public. A student docent program will transform the traditionally passive experience of a planetarium visit into an interactive learning opportunity. Science On a Sphere (SOS) at Fiske Planetarium will raise awareness and understanding of Earth system science for over 00,000 visitors per year, using student docents and newly-developed, tested pedagogy. SOS will enhance Fiske's ability to engage 0,000 university students and 00,000 K-00 students and members of the public. A student docent program will transform the traditionally passive experience of a planetarium visit into an interactive learning opportunity. 