Presentation on theme: "Telescopes Section 1-4. Telescope l Tele – distant, far l Scope- see l Invented in the 16 th century l First used by Galileo Who found moons around Jupiter."— Presentation transcript:
Telescope l Tele – distant, far l Scope- see l Invented in the 16 th century l First used by Galileo Who found moons around Jupiter l Optical telescopes collect light l Two types – Refracting – Reflecting
Refracting Telescopes l Use lenses to bend light l Larger lenses can gather more light l So get better picture l Largest is 40 inches across l Larger are not possible because the lenses distort the light.
l Put telescopes in domes with doors that slide open l Allow them to rotate and elevate l Point at the same point in the sky as the earth turns.
Multiple Mirror Telescopes l Large mirrors are hard to make. l Use several small mirrors that act together l Gather more light than a single mirror
Keck Observatory l 36 mirror hexagon segments- computer controlled l Largest optical telescope
The whole spectrum l Light is a small part of the electromagnetic spectrum l There are telescopes that detect other types of waves. l Radio telescopes- detect radio waves l Many stars give off mainly radio waves l Use computers to create an image from the waves. l Can use several together for even better images
Infrared telecopes l Infrared is heat energy (warming lamps) l Dont travel through atmosphere l Put telescope on a satellite l IRAS Infrared Astronomy Satellite (1983) l ISO Infrared Space Observatory (1995) l Give us images of things that give off little energy, like new stars and nebula