4.7 Astro 1 Section 1 Professor Brandt

4.7 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Wednesday April 7th 1999 Announcements: Lecture notes: Class 35 As usual the test will focus on the main most important ideas rather than details. Will cover both telescopes and cosmology. I have put up a list of key vocabulary words. You should understand what these words mean and how they fit together. This will be a good start for studying for the test. All these words are covered in the textbook but I would be happy to go over any of them if there are questions. Constellation Review Virgo - Spica Corvus Leo Perseus Cassopeia Cepheus Andromeda Canis Major - Sirius Canis Minor - Procyon Orion - Betelgeuse Rigel Auriga Gemini Key Vocabulary Words refracting telescope reflecting telescope Hobby - Eberly telescope charge coupled devices atmospheric "seeing" interferometer resolving power segmented mirror spectrograph cosmology homogeneity assumption of cosmology expansion of the Universe
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the Big Bang model Hubble's Law Olbers' paradox cosmic microwave background blackbody COBE satellite Intrinsic microwave background anisotropy recombination primordial nucleosynthesis critical density open universe flat universe closed universe Telescopes devices used to study electromagnetic radiation - not only optical light here (also radio IR UV X-ray and gamma ray). We covered optical telescopes first. Have three purposes. - increase light gathering power - resolve fine details of cosmic objects - magnify images so we can see them. Two types. Refracting telescopes - use a large lens to gather and focus the light. Reflecting telescopes - use a concave mirror to gather and focus the light focal length - distance from lens/mirror to image formed of a distant light source. Primary lens/mirror and eyepiece. When people speak of telescopes they often make reference to the diameter of the mirror/lens. For example a 2 meter reflector has a mirror with a 2 meter diameter.
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