PCS 181 Lecture Notes - Lecture 1: Maarten Schmidt, Cosmological Principle, White Dwarf
23 May 2017
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Lecture 1: observation, hypothesis, experiment, conclusion, reproducibility (experiment must be reproducible) Same line is (cid:540) = 656. 2927nm in the spectrum of regulus. Radial velocity: this h line has a longer wavelength in the spectrum of regulus. Unit 2: the universe: distance units, lightyear (ly)= distance that light travels in one year, 1 lightyear = 9. 5x1015m, parsec (pc) = 1pc = 3. 26 ly, astronomical unit (au) = average distance between the earth and. Satellite, telstar: they detected a persistent radio hiss when they sent a message from. Italy to n. j: wavelength of that em signal was (cid:540) = 1. 063x10-3m, they tried to find the temperature of the source using the wien. The universe is: isotropic: it looks that same in all directions, homogenous: matter is approx. evenly and uniformly distributed. Universe expands forever: closed universe: density of matter is high gravity will halt the expansion universe will re-contract. = c (0. 16) = 0. 16c = 16% of the speed of light.
