Astronomy 2021A/B Lecture 1: Astro 2021 - Lecture 1.docx
22 Sep 2014
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Document Summary
Mars: white caps are ice, majority of martian icecaps are water, some are carbon dioxide, lowell built an observatory in arizona, thought he saw canals, presumed there were intelligent beings, mars is very similar to our world", venus and mars are the closest planet to us. Wave: a wave is a patter of motion that can carry energy without carrying matter along with it, properties of waves, wavelength is the distance between 2 wave peaks, frequency is the number of times per second that a wave vibrates up and down, wave speed = wavelength x frequency, light: electromagnetic waves. When looking at hot body through a cold gas, you will see the emission lines found in the continuous spectrum as well as the rainbow: spectra of astro, how does light tell us the temperatures of planets and stars, thermal radiation.
