For example, at the Purdue Weather Satellite page you can find hourly satellite images.
One of our favorites is the Astronomy Picture of the Day -- check out the index and browse through the myriad of pictures of objects with descriptions.
And of course, check out the Space Telescope Science Institute's web site for the latest from the Hubble Space Telescope!
The Messier catalog is a list of 110 objects in the sky which are reasonably bright and visible in small telescopes. You will view some of these objects during the semester. Two (of the many) good sites for images of Messier objects are the O.R.S.A. site and the Virtual Observatory.
The Colgate Astronomy Links page contains links to these and many other sites. You will use the Colgate Astronomy Links page for this exercise.