LINKS
Night Sky Information - Weekly information about the night sky and articles on selected astronomical topics.
Bob Jenkins Site Lots of excellent animations of orbits, including planetary orbits in binary star systems in which the stars have unequal masses, triple star figure-eight orbits, exotic orbits, and more. Also this is where you can get the java applet which I used for all the animations here.
Janus and Epimetheus Animation of Saturn's orbit-swapping moons
NASA Space Academy 3D Orbit Viewer A rotatable view of the solar system.
NASA Astrophysics Data System A huge quantity of astronomy and astrophysics articles for serious research, with good search facilities.
Surprise planet discovered in twin star system The first planet found in a close-knit double star system suggests that the galaxy possesses many more planets than previously estimated
The Extrasolar Planets Encyclopaedia
Space.com A space portal.
University of California Planet Search Project
New Scientist, 4th Aug 2001 - A good article about exotic orbits.
The figure-eight orbit (pdf) A mathematical description by Chenciner and Montgomery.
Orbit Xplorer Educational orbit simulator software which has received good reviews. Study elliptical orbits, double stars, escape velocity, Kepler's third law, Lagrange points, the three body problem and more.