Galileo was a scientist and an inventor. He did not invent the telescope but he certainly improved it. Learn who Galileo was and what he invented on these sites. Included are eThemes on the Hubble telescope, inventions, and Copernicus.
Rice University provides this site on the life and science of Galileo. Find the "Galileo Timeline" under "Chronology." The "Science" link has many topics including a topic on the instruments Galileo used and invented.
Learn about Nicolaus Copernicus and why the church had a problem with his heliocentric theory. These sites explain the difference between a geocentric theory and a heliocentric theory. What was the scientific revolution that Copernicus was a part of?
Learn about the largest telescope in the world that is orbiting Earth, the Hubble Space Telescope. Read about the history of its development, what it does, how it is serviced, its orbit, and how it works in space. Sites include images of the telescope, schema, and instructions how to build a paper model.