Building a Simple Refracting Telescope

Part of the Discovering the Universe Curriculum Collection.

Two upside down cups, one marked "A," the other "B" placed on either side of a piece of paper folded to stand on the table. Affixed atop each cup is a round clear glass lens.

What could Galileo see when he looked through his telescope? Build a refracting telescope with lenses similar to the ones he used, and see the answer for yourself.