All effort has been made to make sure these links work.  If you find a dead link, please send an e-mail to Doug Azwell

• celestial sphere
• equinoxes and solstices
• the seasons
• Earth's Orbit and Milankovitch Cycles
• the ecliptic

• Hawaiian Astronomical Society Storybook
• Japanese Starlore
• Solar Folklore

• Aristarchus
• Eratosthenes
• Ptolemy
• Ptolemaic System
• Copernicus
• Tycho Brahe
• Johannes Kepler
• Galileo
• Copernican System
• Newton
• Christian Doppler
• James Clerk Maxwell
• Gustav Kirchhoff
• Albert Einstein
• Niels Bohr
• Edwin Hubble

• electromagnetic spectrum
• electromagnetic spectrum site #2

• Parkes Radio Telescope
• Arecibo Radio Telescope
• James Clerk Maxwell Telescope
• Microwave Satellites
• Spitzer Space Telescope (formally SIrTF)
• Ground-based Infrared Telescope
• Hubble Telescope
• Hubble Telescope Site #2
• Cerro Tololo Observatory
• Keck Observatory
• Hopkins Ultraviolet Telescope
• SOHO Extreme Ultraviolet Imaging Telescope
• Chandra X-ray Observatory
• The Broad Band X-ray Telescope
• Gamma Ray Telescope
• Compton Gamma Ray Observatory

• Solar System Exploration
• Tour of the Solar System
• Planetary Fact Sheet
• Apollo Program
• Clementine Images (Moon)
• Lunar Data
• Global Seafloor Topography
• NASA Earth Science
• Browsable Mars Map
• Lowell's Mars
• War of the Worlds
• Orson Wells Radio Broadcast
• Mars Catalog
• Saturn's Rings
• Pluto Home page
• Pluto

• Cassini at Saturn
• NEAR (Near Earth Asteroid Rendezvous)
• Galileo: Journey to Jupiter
• NASA Mars Exploration Program
• Mars Global Surveyor
• Mars Pathfinder
• Mars 2003 and 2005 Missions
• SOHO (Solar and Heliospheric Observatory)
• Magellan Mission to Venus
• Lunar Prospector
• Cassini Mission to Saturn
• Messenger (Mercury Surface, Space, Environment, Geochemistry, and Ranging)
• Voyager (outer Solar System)
• Contour: Comet Nucleus Tour
• Stardust (comet sample return)
• Solar Wind Sample Return (Genesis)
• Landsat 7 (Earth)
• TOMS (Total Ozone Mapping Spectrometer)
• Earth Observing One
• NASA's Earth Science Enterprise Missions (past, present, future)
• NASA Space Science Missions (past, present, future)
• Upcoming Planetary Events and Missions

• Asteroid and Comet Impact Hazards
• Meteorites
• Meteorite Market
• USAF meteor info
• Geological Time Scale
• Meteorite Man!
• Asteroids
• Cassini asteroid
• When the Sky Fell
• Chicxulub Q and A
• Brief History of Chicxulub Structure
• Chicxulub Seismic Experiment
• Impact Mass Extinction
• What Died Out and When
• Alternative Theories
• Comets in General
• Shoemaker-Levy 9
• Halley's Comet
• Kuiper Belt
• Lunar Meteorites

• Doppler Measurements for 51 PEG
• Planet Search

• Sunspot Cycle
• Sol:  Our Sun
• Solar Data Analysis Center
• Pictures of the Sun from SOHO

• Stellar Evolution Pictures
• Stellar Evolution
• Stellar Gallery

• Periodic Table of Elements
• Nucleosynthesis

• Windows to the Universe
• The Milky Way
• The Milky Way Site #2
• The Milky Way Site #3

• Galaxies
• Galaxies Site #2
• Galaxies Site #3
• Sloan Sky Survey
• Two Micron All-Sky Survey

• Cosmology in general
• Cosmology Q and A
• Cosmology Link Index

• NASA Astrobiology
• Exobiology Strategy Report
• Life on Mars (NASA)
• Life on Mars (FAS)

• NASA (National Aeronautics and Space Administration
• NASA Space Science
• NASA Jet Propulsion Laboratory
• NASA Goddard Space Flight Laboratory
• NASA Johnson Space Center
• NASA Kennedy Space Center
• NASA Ames Research Center
• National Space Sciences Data Center
• The Geosciences Node of the NASA Planetary Data System
• Lunar and Planetary Institute
• Space Telescope Science Institute (Hubble Telescope)
• European Space Agency
• NOAA (National Oceanic and Atmospheric Administration)
• USGS (United States Geological Survey)
• CEPS (Center for Earth and Planetary Studies)
• National Air and Space Museum

• The Space Calendar
• Monthly Star Log (celestial events of the month)
• Space Shuttle / Space Station / Satellite Locator
• Physics and Astronomy Virtual Lab
• spacedaily.com (everything related to space)
• sky charts

• Sky and Telescope Magazine
• Astronomy Magazine
• The Planetary Society
• Students for the Exploration and Development of Space

• McDonnell Center for the Space Sciences
• McDonnell Planetarium (St. Louis Science Center)
• Washington Univesity Observatory
• University of Missouri-St. Louis Observatory
• St. Louis Astronomical Society

• Views of the Solar System
• NSSDC Photo Gallery
• Cool Picture of the Day
• Astronomy Picture of the Day
• Welcome to the Planets
• NASA's Planetary Photojournal
• The Space Images Archive
• The Electronic Universe Project

• Debunking bad astronomy

• Astronomy Picture of the Day