Top:/Science/Astronomy

8 Wonders of the Solar System is a Scientific American interactive feature about the solar system. In 8 Wonders of the Solar System viewers explore the sites that future "space tourists" will want to view. The sites are depicted through the artist Ron Miller's drawings. The tour includes audio and video commentary about the featured sites.

A Walk Through SpaceA slide show of Hubble images set to music.

NASA Educational - Earth Crew, Astronaut School, Meet the Astronauts, Living in Space, Bringing Space Home, Explorer’s Galaxy ,
Amazing Space - Wonderful web-based activities primarily designed for classroom use...Find out what the big deal is about black holes; make a batch of comets in your very own kitchen; or attend the Hubble Deep Field Academy and train to be a scientist--all from the comfo
Antimatter:Mirror of the Universe - The antimatter that propels Star Trek’s faster-than-light starships is not simply the stuff of science fiction. Even non-physicists can learn about real antimatter at this Mirror of the Universe site. Webcasts bring you to a virtual classroom.
Asteroids - Your mission, should you choose to accept it: determine the extraterrestrial culprit of various catastrophic occurrences, such as a chunk of rock that fell from the sky and smashed a Chevy Malibu. This interactive site from National Geographic involves
Astronomy Resources - designed to bring together the latest resources and sources on an ongoing basis from the Internet for astronomical resources

Black Holes: Gravity's Relentless Pull ...interactive site introduces the properties of black holes. You can travel to and into a black hole and see what happens to certain objects when they are placed in a black hole. Many interactive exercises to help illustrate the text are provided.

Celestia... free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X. Unlike most planetarium software, Celestia doesn’t confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy.
Gemini Observatory - The Gemini Observatory consists of twin 8-meter optical/infrared telescopes located on two of the best sites on our planet for observing the universe. Together these telescopes can access the entire sky.

Hubble Telescope ...Explore the universe through the lens of the Hubble. Over one thousand high quality photos of planets, stars, nebulae, and galaxies, complete with individual descriptions, can be viewed online and downloaded for printing and personal use...Take a virtual tour of the universe...

Journey Into Space: Gravity, Orbits, and Collisions ...developed by Scholastic in partnership with the American Museum of Natural History, supports curriculum standards and teaches skills like observation, finding and predicting patterns, classification, and inference. The site includes articles from Science World and Super Science magazine, interactive online activities, and a space library. The teacher's guide includes lesson plans and handouts to enhance the learning experience.
Mars Exploration Program - Students - Animated activities and games related to Mars
NASA’s Chandra X-ray Observatory - stunning, high-energy panorama of the central regions of our Milky Way galaxy. The findings are an important step toward understanding the most active area of the Milky Way as well as other galaxies throughout the universe.

Retrograde Motion...excellent interactive provides a first hand look at retrograde motion. Features include the ability to manipulate the radius of 3 different planets, the planet you're "looking from" and the one you're "looking at". The Introduction, How To, Exercises and Solutions sections make this an effective tool for both teaching and learning.
Solar Data Analysis Center - the latest ground- and space-based solar images in the SDAC archives,up-to-date information on solar activity, including images, flare locations, flare predictions, and links to the LMSAL "last events" page, which gives a graphic view of solar

Stellarium is a powerful and free planetarium software package. Over 120,000 stars and constellations from the Hipparcos catalogue including descriptive information. Images of nebulae, the Milky Way and realistic atmosphere, sunrise and sunsets.
Windows to the Universe - a user-friendly learning system covering the Earth and Space sciences...the site is written in three reading levels approximating elementary, middle school and high school reading levels.