This is a diagram of the Apollo 15 & 16 Gamma-ray Detector from the NASA website. Primarily intended to study the Moon's radioactivity, it made measurements of the cosmic gamma-ray background during its trip. It shows...

Project CLEA at Gettysburg College and the XMM-Newton Education group at Sonoma State University have created a new computer-based activity. Students analyze realistically simulated X-ray spectra of a supernova remnant...

This resource will demonstrate the inverse square law to students and will show that this law applies to both the intensity of light and the force of gravity. The relative amount of sunlight received in the vicinity of...

These web pages, authored by Nick Strobel, contain material explaining Einstein's general and special theories of relativity. Gravity and warped spacetime are included, along with explanations of the impact on...

This website, created by Andrew Hamilton of the University of Colorado-Boulder, gives multiple gif animations related to black holes ranging from falling into a black hole to Hawking radiation. These animations are...