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Notes for Final

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Notes Omega is density Omega (m) is density of matter & omega (lamda) is dark energy Plot : X axis is density of matter y axis is density of dark energy Anything with the sum of the two is 1, is a flat world. Matter # is actually .23 so Dark energy would be about .77 Questions: What if the sum isn’t one? How do we know its equal to one? From measuring distances of supernovae, we know it used to expand slower so it’s speeding up. Vertical is how much matter in universe. You are comparing size of speckles to get 1 Lifetime = star about to turn off main sequence gives lifetime
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Unformatted text preview: 1/m^2.5 gives answer in solar lifetimes If you know mass of a star on main sequence, you can get its luminosity. Lifetime of universe Geometry of universe (the confusing graph. Ω = ΩA + Ωm = 1) which tells us universe is flat. Lifetime of star clusters (age is same as the star just now dying off main sequence) F = L / 4pid^2 (this is how we get distance) this could be related to D in hubble’s constant which could then go into age of the universe which could conflict with the age of a star cluster See how formulas relate...
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