Center for Educational Technologies
(Home of NASA's Classroom of the Future Program)
Space
Kids
Send Your Name To Mars (from NASA)
How Things Work
the
Universe Today - Space Exploration News from Around the Internet,
free newsletter
Astronomy
Education Resources (HPCC/ESS K-12 Outreach Project,
University of Washington)
The Space Frontier Foundation
NASA
Spacelink - excellent resource
Challenger
Center for Space Science Education
Center
for Science Education - UC Berkeley Space Sciences
Laboratory
NASA's Solar System Simulator
Amusement Park Physics
Debunking Junk Science
The Teachers'
Newsletter (free
from the Astronomy Society of the Pacific)
PC's in Space (from NASA with free
software)
The Mars Millennium Project (for kids)
PhysLINK - excellent link for teachers with physics questions, winner of many web awards
"The Nine
Planets" (a
general tour of the Solar System)
"The Nine
Planets" (same name as above, but different site - very nice)
NASA's
Observatorium
Learning Technologies Channel - from NASA, requires RealPlayer (free)
Bill Nye, The Science Guy
SkyWatch
for The Dominion Post (by Prof. Jack Littleton)
Constellations
and Mythology
Information Center for
New Star Gazers (A primer for Beginning Astronomers)
Periodic Table of the
Elements (from Los Alamos National Laboratory)
List of Physics Laws
Physical and Astronomical Constants
(includes a calculator if you have JavaScript)
Professor Freedman's Math Help
Stephen Hawking's
Universe
Astronomy
Shareware 
(use "Astronomy" as
keyword)
Sky&Telescope Magazine On-Line
Astronomy Resource List
How to buy your
first telescope (or binoculars) for star gazing
The Artemis Project (Establishing a permanent
self-supporting community on the moon)
Search for Extraterrestrial Intelligence
(SETI) Institute Home Page
Space Camp
Teacher Links 
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the Extraordinary Links page