Before using the applets below, you will need the latest Java Plugin... You can find the appropriate plugin at the sites listed below:
For PC Users: You need the J2SE 1.4.2_06 JRE includes the JVM technology. Click "Download Now" and pick your operating system	For Mac Users: You should have plugin already on your computer (It comes standard with OSX). If your having problems check Apples Java Site below for updates.

Galactic Communication: A visualization of the "Drake equation" and more. Demonstrates how the probabilities of contacting and communicating with extraterrestrial civilizations depend on the birth rate of civilizations and their mean lifetimes.

Binary Star Orbits: A simulation/visualization of orbits of binary stars. User can control all orbital parameters. Applet displays views of orbits and a dynamical graph of the Doppler shifts of each star.

Extra-solar Planets: A visualization of how astronomers fit model Doppler velocity curves to data representing actual extra-solar planetary systems.

Planetfinder: An on-line learning module using the Extra-Solar Planets applet.

Radiative Transfer: Simulates the propagation of photons through a slab of atoms. User can control the number of atoms and the absorption and scattering cross-sections as functions of color.

Random Walk: A simulation of random walk in 2 dimensions.

Doppler Shift: A visualization/simulation of Doppler shifts of sound waves. The user can control the sound speed, frequency, velocity of source or receiver.

Planetary Transits: A visualization/simulation of the extrasolar planet searching technique. The user can control planet size, orbital radius, and randomized error.

Simplified Planetary Transits: A simplified, more focused version of Planetary Transits

Eclipsing Binaries: A visualization/simulation of the phenomena of eclipsing binaries measuring total system brightness. The user can control star radius, temp, orbital radius, inclination , and randomized error.