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LT 3: I can compare refracting and reflecting telescopes.

Refracting Telescopes Use lenses to bend light (refraction) Objective lens gathers light Eyepiece lens magnifies the light Lens focuses different wavelengths of light at different distances which limits the size of the objective lens. Reflecting Telescopes

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LT 3: I can compare refracting and reflecting telescopes.

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  1. Refracting Telescopes Use lenses to bend light (refraction) Objective lens gathers light Eyepiece lens magnifies the light Lens focuses different wavelengths of light at different distances which limits the size of the objective lens. Reflecting Telescopes Uses mirrors to gather and focus light Light is reflected off of one lens onto a 2nd mirror which then reflects the light to the eyepiece Mirrors can be very large without affecting the quality of the image LT 3: I can compare refracting and reflecting telescopes. Telescope: an instrument that collects EMR from the sky and concentrates it for better observation.

  2. Nonvisible EMR Telescopes Each type of EMR must have its own telescope Affected by Earth’s atmosphere Most of these telescopes are in space Hubble Space Telescope Chandra X-ray Observatory Spitzer Space Telescope (infrared telescope) Light Telescopes Reflecting and Refracting Telescopes Largest Reflecting Telescopes are in HI LT 4: I can explain how telescopes for nonvisible electromagnetic radiation differ from light telescopes.

  3. Keck Telescopes

  4. Other Spacecraft • Voyager 1 & 2 • Launched in 1977 • Investigated Jupiter, Saturn, Uranus, and Neptune • Galileo • Orbited Jupiter and its moons from 1995 – 2003 • Cassini-Huygens • Launched in 1997 and began orbiting Saturn in 2004 • Spirit & Opportunity • Explore Mars beginning in 2004 • Confirmed water had once been on Mars • Curiosity • Most recent rover sent to Mars • Started exploring the surface in Summer 2012

  5. Other Exploration • Humans first went into space in 1960s • 1969-1972 NASA landed 12 people on the Moon • 2 major Shuttle losses • 1986 Challenger • 2003 Columbia • Satellites • Provide weather information • Broadcast TV signals • GPS

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