University of California
University of California Berkeley: Classifying Galaxies
Find out how galaxies are classified and then see if you can apply that knowledge to identify the different types of galaxies. In addition to explaining Hubble's galaxy classification system, the site has links to Hubble Space Telescope...
TED Talks
Ted: Ted Ed: Dark Matter: How Does It Explain a Star's Speed?
Video describes how stars move in a spiral galaxy and how their speeds can be explained by accounting for dark matter. [3:17] Includes a brief quiz and a list of additional resources to explore.
Space Telescope Science Institute
Amazing Space: Galaxies Galore: Games and More
This is a fun and useful site to learn about galaxies. Content includes a building model to create your own Milky Way, games for learning the various types of galaxies, and more fun games.
National Earth Science Teachers Association
Windows to the Universe the Milky Way Galaxy
Learn what Milky Way galaxy is made of and what it looks like, as well as how it relates to other known galaxies. Read "Questions and answers about the Milky Way" for further information.
Space Telescope Science Institute
Hubble Space Photographs: Hst's Greatest Hits 1990 1995
Breathtaking images from the Hubble Space Telescope give a new perspective to our world.
NASA
Nasa: Spitzer Images
See some of the beautiful color images that were taken by the Spitzer space telescope.
Space Telescope Science Institute
Hubble Site: Way Out!
Can you help a cow plot a path out of the Milky Way? This hilarious space game is for all ages and is offered by HubbleSite. Users may pick their level of expertise and can choose from novice, pretty smart about space, or an astrobrainiac.