The International Solar-Terrestrial Physics Science Initiative (ISTP), a collaborative effort by NASA, the European Space Agency (ESA), and the Institute of Space and Astronautical Science (ISAS) of Japan, has recently...

Authored by Eleanor Kopsian of Franklin Frazier, this is an activity intended to help students understand orbital motion and Kepler's Laws through a comparison of a circle and an ellipse and the application of Kepler's...

Authored and curated by David P. Stern, these pages explore orbits and the "Lagrangian points", where objects will orbit the sun with the same period as the earth. This has applications for solar monitoring spacecraft....

This applet shows from three different physical perspectives the orbit of a low-mass test particle around a non-rotating black hole. Below the applet is an instructional guide to the applet and a description of the...

This web site contains in-depth notes with examples and practice problems for several topics in introductory physics and astronomy. Some of these topics include classical mechanics, geometric optics, celestial...