AST251H1 Lecture : lecture note
28 Jan 2012
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From big bang to how the earth formed. Spectra, light cut up into different colours, each element characteristic lines, overall spectrum m to nm. Distance astonishing small, tones of lines, spectra so important, two spectra next to each other, utterly identical, except distant galazies slightly higher wavelenghth red, redshifted. Same picture but is reversed, blue towards blueshift, Hubble law, hubble measured redshift for many galaxies, almost all galaxies move away from us, and further away the galaxy moves faster twice far away moves twice as fast. What does it mean, 1cm apart bake it 3 x as large becomes 3 cm, every raisin moving away from all raisins. Backwards in time everything moved towards, bc raisins close doesn t mean universe is smaller universe is infinite, independednt of universe being finite r infinite, After 1 sec protons and neutrons stick to each other, and then two deutrne and then colliding and colliding.
