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This site is intended to be a basic introduction to telescopes. Telescopes are the fundamental tool in observational astronomy, and understanding how they work is central to understanding what we can learn from them.

It all started in the 1600's. An Italian scientist Galileo Galilei was the first recorded person to have pointed a telescope towards the night sky. He was able to see amazing things like the rings of Saturn, and the Milky Way. Galilei was able to discover four moons of Jupiter, and see mountains and craters on our moon.

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Using cardboard tubes and convex lenses along with other household items, students can build refracting telescopes using the instructions below!

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