Telescopes Section 1-4. Telescope l Tele – distant, far l Scope- see l Invented in the 16 th...
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Transcript of Telescopes Section 1-4. Telescope l Tele – distant, far l Scope- see l Invented in the 16 th...
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Telescopes
Section 1-4
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TelescopeTele – distant, farScope- see Invented in the 16th centuryFirst used by Galileo Who found moons
around JupiterOptical telescopes collect lightTwo types
– Refracting– Reflecting
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Refracting TelescopesUse lenses to bend lightLarger lenses can gather more lightSo get better pictureLargest is 40 inches acrossLarger are not possible because the
lenses distort the light.
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Yerkes Observatory
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Reflecting TelescopesUse mirrors to collect lightFirst made by NewtonMirrors can be largerLargest is 200 in. at Mount
Palomar near San Diego
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Put telescopes in domes with doors that slide open
Allow them to rotate and elevatePoint at the same point in the sky as the
earth turns.
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Multiple Mirror Telescopes
Large mirrors are hard to make.Use several small mirrors that act
togetherGather more light
than a single mirror
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Keck Observatory36 mirror hexagon segments- computer
controlledLargest optical
telescope
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The whole spectrumLight is a small part of the
electromagnetic spectrumThere are telescopes that detect other
types of waves.Radio telescopes- detect radio wavesMany stars give off mainly radio wavesUse computers to create an image from
the waves.Can use several together for even better
images
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Radio Telescopes
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Arecibo
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Infrared telecopes Infrared is heat energy (warming lamps)Don’t travel through atmospherePut telescope on a satellite IRAS Infrared Astronomy Satellite (1983) ISO Infrared Space Observatory (1995)Give us images of things
that give off little energy,like new stars and nebula
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Ultraviolet telescopesAlso need to be on satellitesUsed to view our sunAlso found on the Hubble Space
Telescope
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X-ray telescopesAlso need to be on telescopesGive information on life cycles of stars.Uhuru 1970Chandra currently in service
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Hubble Space TelescopeCombination of telescopes – optical and
ultravioletHas been repaired and upgraded twiceGiving scientists views of the universe
they have never had before
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