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Rosette Nebula Cool Astronomy Links Comet Halley

  always arrive during the middle of the term, and definitely vary in spectacularness from year-to-year

Astronomy Picture of the Day
The NASA Multimedia Gallery - loads and loads of pictures
What's Up? - the week's sky highlights, from Sky & Telescope
The Leonids
Moon Phases by Chris Dolan
Nearby Stars from SolStation.com
Space Weather News
Real Pictures of the Sun from NASA
Universe Today - space news from around the internet
Encyclopedia of Astronomy and Astrophysics

Basic Optics -- definitions and interactive tutorials
Gravitational Orbits -- your basics from Kepler
Blackbody Radiation
Interactive Hydrogen energy level diagram
Atomic Spectra (visual wavelengths)
Spectroscopy Net
Maxwell-Boltzmann velocity distribution visualization applet
Boltzmann equation visualization applet (population of atomic energy levels)
Visual Spec -- spectroscopy concepts
Simulations of Stellar Nucleosynthesis
Stellar Structure and Evolution Simulator

The Once and Future Sun -- stellar evolution in context
Web Simulations of Astrophysical Phenomena -- highly recommended!
Orbit Animations of the nearest stars from SolStation.com
The Nine Planets - a Multimedia Tour of the Solar System
Solar System Orbit / Collision Simulators
An illustration of chaos in the solar system: the Double pendulum animation of pendulum; animation of the orbits
Movie of the orbital motions of stars at the Galactic Center -- highly cool!

Caltech Astronomy Homepage
Robinson/Downs Rooftop Observatories -- Caltech's instructional telescopes