"The Nebraska Astronomy Applet Project provides online laboratories targeting the undergraduate introductory astronomy audience. Each lab consists of background materials and one or more simulators that students use as they work through a student guide. Pretests and posttests can be used to gauge student learning."
University of Nebraska-Lincoln. (n.d.). The Nebraska Astronomy Applet Project
. Astronomy Education at the University of Nebraska-Lincoln. Retrieved March 22, 2023, from http://astro.unl.edu/naap/