California Institute of Technology
Spitzer Space Telescope: Stephan's Quintet
Under the heading, "A Shocking Surprise in Stephan's Quintet" this site examines specific details of an image displaying a galaxy cluster named Stephan's Quintet. The text under the image serves to explain, in great detail, the specifics...
Curated OER
Astro Lab: Space, a Contemporary Vision of the Universe
Explore how our contemporary understanding of the universe came to be. This overview looks at the history of three main areas of study, namely space, time, and the arrangement of matter.