How have telescopes changed over time?

Telescopes have improved a lot over time. They have grown more complex.
Telescopes have become bigger! People have changed telescope lens and made them pick up certain rays. Lens on telescopes have changed to move in certain ways. Galileo made the first telescope. Lots of people have improved Galileos design. Scientist, also Astronomers, (etc).
Telescopes were once just made for being on Earth and seeing starts and certain planets. The Hubble telescope has totally changed that idea. It has been up in space for a while. People have made improvements on the Hubble while up in space. We've been using the Hubble telescope for a long time.