For links to web sites specifically for teachers, visit our Instructional Resources page.

There are thousands of excellent Astronomy and Space Science Links on the World Wide Web. The following links are just a sample. If you don't find your favorite site listed, please send us the address and a brief description of the site.

General Astronomy:

Black bullet Astronomy Picture of the Day
A new picture and explanation by a professional astronomer each day.
Black bullet HubbleSite Gallery (Hubble Telescope)
Full Collection of Hubble Space Telescope images. Also check out the News Center for press releases.
Black bullet Amazing Space (educational resources related to astronomy and the Hubble telescope)
Amazing Space uses the Hubble Space Telescope's discoveries to inspire and educate about the wonders of our universe. It's a great source for current astronomy activities.
Black bullet On-Line High School Astronomy Course
Supplement your astronomy knowledge by browsing through this on-line textbook.
Black bullet  The ASTRONOMY CAFE
"An Internet Resource for the Astronomically Disadvantaged." Astrophysicist and author Dr. Sten Odenwald's unique blend of fact and fun, including the inside story on what it's like to be an astronomer, an "Ask the Astronomer" component, and a survey that you can fill out to see if you have what it takes to be an astronomer.
Black bullet Basics of Radio Astronomy
A "workbook" for understanding radio astronomy, the electromagnetic spectrum, and how to use. It was designed to support training for the Goldstone-Apple Valley Radio Telescope, but it's helpful for anyone who wants to learn about how to do astronomy in this "invisible" part of the spectrum.
Black bullet SEDS Internet Space Warehouse
Searchable archive of images and more!
Black bullet Solar System Simulator
Shows you the Solar System as seen from anywhere in it!
Black bullet Kids Astronomy Homepage
Learn about Outer Space and become a Junior Astronomer!

Observational Astronomy:

For observing satellites, especially Iridium flares, see the information in the Earth and Its Satellites Section.
For star charts, see the Current Sky section.

Black bullet Sky & Telescope's "This Week's Sky at a Glance"
Great suggestions and diagrams of what to go out and look for in the current night sky.
Black bullet Minor Planet Center
This is the clearinghouse for information regarding minor planets (asteroids, comets, etc.) as well as a place for confirming and reporting new discoveries.
Black bullet Image Processing via the Internet
Absolutely amazing! Very recently developed, this Virginia Tech product will allow you to image process your images via the web. Check it out.
Black bullet Madison Weather from the Weather Underground
Get important information for your observing session: sun set and rise, moon phase, moon set and rise, dew point, cloud cover, extended forecast, and now it even has a link on that page to a nice star chart! If you're not from Madison, link to the Weather Underground main page and choose your location.
Black bullet THE TIME AT THE TONE...
Get the correct time for syncing your system clock to the real world here!
Black bullet Sunrise/Sunset computation
Computes sunset and sunrise times for your location.
Black bullet The STScI Digitized Sky Survey
Excellent source for confirming a discovery or viewing images of objects outside the Solar System.For the best results follow these steps:
  1. Fill in the name of an object which is outside the Solar System.
  2. Click the "NED" button.
  3. Click "Get Coordinates".
  4. Select "Gif" for the file format.
  5. Then click "Retrieve Image".
Black bullet SEDS Messier Database
Nice pictures of these deep sky objects. See the "Messier Logging Software" under the software section of this list.
Black bullet Sky & Telescope Magazine's "How to Start Right in Astronomy"
A good source for information about getting started in observational astronomy.
Black bullet Hands-On Universe
An educational program that enables students to investigate the universe while applying tools and concepts from science, math, and technology. HOU participants can request observations from an automated telescope, download images from an archive, and analyze them with user-friendly image processing software.
Black bullet Washburn Observatory (UW-Madison)
A tremendously important historical observatory, located right here in Madison. Information about public viewing nights included.
Black bullet Web sites for observing Aurora (Northern Lights)
Black bullet find out what's happening on the Sun, check for aurora alerts, and much more.
Black bullet Aurora Information and Images (Univ. of Alaska): also has forecasts and more.
Black bullet Auroras - Paintings in the Sky (Exploratorium): self-guided tour of Auroras, and list of links.


Black bullet Astronomy Cast
This "fact-based journey through the cosmos" is a wonderful resource presented in an entertaining format that is easy to understand. This podcast is also available through iTunes.
Black bullet Hidden Universe
Highlights the exciting discoveries of NASA's Spitzer Space Telescope.This video podcast is also available through iTunes.
Black bullet IRrelevant Astronomy
You'll love this VERY creative animated video podcast series that teaches about infrared astronomy and NASA's Spitzer Space Telescope. This podcast is also available through iTunes.
Black bullet HubbleCast
A great video podcast from the NASA/ESA Hubble Space Telescope.  This podcast is also available through iTunes.
Black bullet NASACast
NASA has several podcast series, but this is a great place to start. You'll find both audio and video postcasts. These podcasts are also available through iTunes.
Black bullet Many More!
Search the web and iTunes to find the astronomy podcasts that will soon become your favorites!


Black bullet Madison Astronomical Society
Find out how to become a member, when and where the meetings are, and includes information about public viewing sessions.
Black bullet UW Space Place
Get information about this facility, the programs they offer, and more.
Black bullet UW-Madison Astronomy Department
Includes information about their undergraduate and graduate programs and faculty.
Black bullet Space Science and Engineering Center
Black bullet International Dark-Sky Association
Excellent information about light pollution and solutions.
Black bullet International Planetarium Society
If you are interested in planetariums, check out this excellent organization.
Black bullet Loch Ness Productions
Planetarium production company. You may enjoy browsing through some of their visual and music products. Check out their list of other planetariums around the world!


Black bullet ASTRONOMY Magazine
Information about Astronomy magazine and other resources.
Black bullet SKY & TELESCOPE Magazine
The homepage for Sky & Telescope magazine and other resources.
Black bullet The Astronomer Magazine
An online resource for amateur and advanced amateur astronomers.
Black bullet The Astronomical Society of the Pacific (APS)
An international organization for amateur and professional astronomers. Publishers of the excellent Mercury magazine.

Software (free and shareware):

Black bullet Starry Night (Windows and Mac)
This is a great program for simulating the day and night sky, and so much more. It's not a free or shareware program, but there are several levels with a range of prices.
Black bullet Celestia
This program is not as user-friendly as Starry Night, but it's a fantastic powerful program for simulating the sky for any date, time, and location.
Black bullet Sky Charts Software (Windows)
This is a FREE piece of software that acts as a virtual planetarium or sky chart. Excellent for observational planning and relatively easy to use. A definite download for those on a budget.
Black bullet Seti@Home Software (Windows or Mac)
Your computer can use its screen saver time to download, process and search for extraterrestrial intelligence! Download the IBM compatible or Macintosh versions now! Note: This screen saver is computer intensive, but it is doing the processing when your not using the computer, so give it a shot. By the way, the display while the software is running is pretty cool...
Black bullet Planetarium 2.0 for Palm OS handheld users
Astronomical software for the Palm OS. It has limited use as a star-charting program but is wonderful for getting information on the positions of the planets, phase of the moon, etc. Free downloadable demo available.
Black bullet 11 Best Astronomy Apps for Amateur Star Gazers - 10.13.2013
Black bullet Project CLEA: Contemporary Laboratory Experiences in Astronomy
These applications help high school and college students to understand some difficult concepts. They can also be used by a middle school teacher to demonstrate things like how astronomers use Spectroscopy to classify stars!


See also Earth and Its Satellites

Black bullet NASA
Excellent starting point for all NASA on-line resources.
Black bullet NASA Wavelength Digital Library
This site makes it much easier to find the astronomy-related NASA educational products.
Black bullet The Space Place (NASA)
Tons of activities and games!
Black bullet NASA Jet Propulsion Laboratory (JPL)
JPL: the leading US center for robotic exploration of the solar system (Galileo, Magellan, Ulysses, Cassini, and much more).
Black bullet Solar System Exploration: Launches and Events
Excellent calendar of recent, current, and future missions, and specific important events in those missions. Calendar items are linked to their home pages.
Black bullet NASA's Space Science
This site gives up to date info on the the Space Science (Astronomy and Cosmology) Division of NASA.
Black bullet NASA Human Spaceflight: The International Space Station
This is main site for the latest information for this space station now being assembled and operated in orbit.
Black bullet Basics of Space Flight
A "workbook" for understanding the general concepts associated with space flight, and deep space missions in particular.
Black bullet Near Earth Asteroid Rendezvous Mission Homepage
The Homepage of the NEAR Mission.
Black bullet Mars Global Surveyor: Welcome to Mars
This is the Homepage of the Mars Global Surveyor. It includes many up to date images and other good references.
Black bullet 2001 Mars Odyssey
The home page for this mission: launch April 7, 2001; arrived at Mars October 24, 2001.
Black bullet Mars Rover Mission (2003)
The home page for this mission; 2 separate rovers: launching May and June, 2003; arrive at Mars January, 2004.
Black bullet Galileo
This page includes many images of Jupiter and links to other good sites on the web.
Black bullet Stardust
Homepage of the Stardust Mission with an excellent FAQ and some good images.
Black bullet Cassini: Mission to Saturn
Homepage of the Cassini Mission to Saturn, which arrives in the summer of 2004. Incredible resources -- especially for teachers and students.
Black bullet Women @ NASA

Earth and Its Satellites:

Black bullet Space Science and Engineering Center
Black bullet Spot the Station: find out how and when to see the International Space Station (ISS) fly over your location.
Search for upcoming flyovers on this site, or sign up for email or text alerts, which will notify you of times when the space station will pass over your home location, and which direction to look.
Black bullet Satellite Flybys at
Enter your zip code and they'll give you a list of when and where to look to see a wide range of satellites. They also have a mobile app for iOS and Android devices.
Black bullet Heavens Above: Earth's Satellites that are Visible from Madison, WI
This site very accurately predicts the time, altitude and azimuth for visible overpasses of some of the Earth's satellites, such as the International Space Station, Iridium Flares, and many others, for individuals living very close to Madison, Wisconsin!
Black bullet Heavens Above: view the Earth's Satellites from Anywhere Else on Earth
This site very accurately predicts the time, altitude and azimuth for visible overpasses of many of the Earth's satellites, such as the International Space Station, Iridium Flares, and many others, from anywhere on planet Earth if you know your longitude and latitude.
Black bullet Earth Viewer
Up-to-the-minute map of the Earth showing day/night, and satellite images.
Black bullet The Full Moon Atlas
A complete series of interactive lunar maps, with more than 2,500 geographic formations (including craters, mountains, lakes, seas and valleys) identified simply by moving your mouse cursor over the feature.
Black bullet Astronaut Photography of Earth

The Solar System:

For web sites related to NASA missions, look in the N.A.S.A. section.

Black bullet Madison Planet Stroll
Take a virtual tour, or a walking tour, through a scale model of the solar system here in Madison, Wisconsin!
Black bullet Planetary Photojournal: NASA's Image Access Home Page
If you are looking for photos of the planets, look here!
Black bullet Build a Solar System
This web site helps you do the math to shrink the solar system down to the size you want for a scale model. If you are
Black bullet Big Bear Solar Observatory
An awesome site for the current appearance of the Sun's surface (full disk image). The site also provides a virtual tour of the observatory.
Black bullet Solar System Simulator
View your favorite planet or moon from many different points of view (above, below, Earth, another planet, or from several space probes). Excellent resource for learning about the planets and understanding what you are seeing in the eye-piece of a telescope.
Black bullet Mission to Mars
1st Place in "ThinkQuest: An International Web-site Design Contest". Mission to Mars is an interactive educational site that shares information about our exploration of that planet and gives you a perspective on what is involved with the design of a mission. The central attraction here is the interactive mission simulation, which puts you in control of design and execution of a mission with a probe landing on the Red Planet.
Black bullet Solar System Live
View the planet's positions today or any day... complete with ephemeris data.
Black bullet Your Weight On Other Worlds
Ever wondered what you would weigh on other worlds? Here's your chance to find out!
Black bullet The Nine Planets Solar System Tour
Excellent source of fairly current information about the planets of our solar system and their moons.
Black bullet Mars Atlas home page
Browsable, zoomable, scrollable atlas of Mars.
Black bullet NASA Planetary Data System Map-A-Planet
Provides a global point and click system for exploring various planets.
Black bullet Magellan
Information about this mission, and Venus images from the Magellan space probe.
Black bullet PDS Imaging Node - Venus
Clickable, zoomable map of Venus using data from Magellan and Galileo.

Current Night Sky: Star Charts, Stars and Constellations (mythology)

Black bullet Portraits of Stars and their Constellations
Dedicated to showing that all stars are not the same, this award winning web site, created by Dr. James Kaler (an astronomer from the University of Illinois), has everything you'd want to know about stars and constellations. This incredible resource includes written information and descriptions, photos, weekly highlights (Skylights), spectroscopy, and more.
Black bullet Heavens Above: current information as seen from Madison, Wisconsin, USA
In addition to providing excellent satellite pass predictions, this web site also provides a star chart (set for Madison), current locations of planets and minor planets, constellation information, rise and set times for the sun and moon, and more.
Black bullet Heavens Above: current information as seen from anywhere outside of Madison, Wisconsin, USA
In addition to providing excellent satellite pass predictions, this web site also provides a star chart (can be set for your location), current locations of planets and minor planets, constellation information, rise and set times for the sun and moon, and more. 
Black bullet Find Sun and Moon Rise and Set Times
Click on the map to find the rising and setting times for the sun and moon. This is one of the easiest sites to get this information from.
Black bullet
Free publication-quality sky maps and star charts, with a description of some of the interesting features of the current sky (see copyright information on that page).
Black bullet Make a Planisphere
Washington Jefferson College has made a great planisphere activity that you can print and make. A planisphere is a star chart that you can set the date and time for.
Black bullet Sky View Cafe
This site turns your web browser into a planetarium application! It may be slow to load originally, but works quickly after that. It provides: a star chart; planet orbits and positions (including heliocentric longitude); positions of Jupiter and Saturn's moons; day/night diagram for the year; day/night map of the Earth; calendar with moon phases; tables including rise and set times, ephemeris, and more.
Black bullet Aboriginal Star Knowledge
An illustrated page filled with Native American sky mythology and ceremony.
Black bullet The Perseus Project
A digital library of mythology with extensive resources for classical Greek history.
Black bullet Ancient Egyptian Myths
Illustrated pages relating Egyptian myths to aspects of their world including the sky and Earth.
Black bullet Nocturnal animals videos:
While you are out enjoying the night sky, don't miss the opportunity to explore the other aspects of the night, like nocturnal animals. You'll love the great backyard videos at this site. We use (with permission) a few clips from this site in our Nightwatchers program.