Astrophysics

• Chandrasekah Limit

  maximum mass of a white dwarf. 1.4 solar masses.
• Isotropic

  The same in all directions
• homogeneous

  has a constant matter density
• Units of Hubble constant

  km/sec/Mpc
• how do you find the age of the universe

  1/hubbles constant
• order of the universe creation

  -expands rapidly in a period of inflation

  - First fundamental particles gain mass

  - quarks bind to form hadrons

  - universe expands and cools

  - universe is cool enough to form atoms. EM radiation from this stage is detected as microwave background radiation.
• timing periods of the universe creation

  - 10^-35

  - 10^-6

  - 10^-3

  - 380,000 years
• Luminosity

  the total amount of energy radiated by an object every second