TELESCOPES From The Way Things Work By David Macaulay

Telescopes A telescope gives a close up view of a distant object Most telescopes work the same basic way A real image of an object is magnified inside of a telescope tube The degree of magnification depends on the eyepiece lens There are many kinds of telescopes: Refracting, Reflecting, Radio, Space

Refracting Telescopes In a refracting telescope, an objective lense forms the real image that is viewed by the eyepiece lens. The image is upside down Astronomy

Reflecting Telescope The larger concave primary mirror forms the real image that is then viewed by the eyepiece lens. A second mirror reflects the rays form the primary mirror so that the real image is formed right-side up Used in astronomy- wide mirrors can catch more light from far away

Radio Telescope A large curved metal dish used to collect sound waves Reflects them to the center of the dish to an antenna The weak electric signal then goes to a computer

Space Telescope Hubble space telescope is part eye and part radio telescope It will revolutionize astronomy It orbits the earth, and sees 7 times farther into the universe than at ground level May also see back into time by seeing old light waves from distant galaxies

VOCABULARY ANCESTORS- People from whom one is descended SUMMONING-asking to come ATTENDANTS- people who wait on someone HEAVENS- the sky as viewed from Earth VAIN- conceited

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