ASTR 151 1st Edition Lecture 7 Outline of Last Lecture 1. 5.1 Optical Telescope2. 5.2 Telescope Sizes3. 5.3 Images and Detectors4. 5.4 Atmospheric blurringOutline of Current Lecture 1. 5.5 Radio Astronomy2. 5.6 Interferometry3. 5.7 Space-Base Astronomy4. 5.8 Full-Spectrum CoverageCurrent Lecture1. 5.5 Radio Astronomya. Adaptive Optics – real time changes in atmospherei. Controls mirrors based on temperature and orientationii. Mirrors can be made up to 8 meters; larger mirrors are made by multiple conjoined mirrorsiii. See data while it is being gatherediv. If data acquisitions happens conditions may changeb. Radio Telescopesi. Prime focusii. Largest radio telescope is 1,000ft dish at Areciboiii. Resolution still depends on wavelengthc. Advantages to Radio Astronomyi. Less sensitive to imperfections due to longer wavelengthii. Observes the sky 24 hours a day2. 5.6 Interferometrya. The amount of interference depends on the direction of signalb. Can be done with light but it`s difficult to absorbc. Combines information from several widely spread rates – Electro-Magnetic Signals (EM) are super imposed to extract information about thewavesd. Construct in-phase - when sound waves move in unisone. Destruct out-phase - when sound waves move out of unisonf. Infrared radiation produces images where visible radiation is blockedi. Can use telescopes and lensesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.3. 5.7 Space-Base Astronomya. Infrared Telescopesi. The Spitzer telescopesb. Ultra Violet telescopesc. X-rays and Gamma rays won`t reflect off mirrorsi. X-rays will reflect if it happens to come in fairly shallowd. Gamma raysi. Can`t be focused at all so images are blurry4. 5.8 Full-Spectrum Coveragea. James Webb Space Telescopei. Looks for light existing in the early universeii. Can see in infraredb. Redshifti. Wavelength changes based on motion away and toward observer aswell as speedc. Cosmo Redshifti. Shows the result of the universe expandingii. Depends on how quickly and object
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