A Very Brief History of the Universe:Notes:
Giga (abbreviated G) is the international term for 1,000,000,000 or 10
9. In the U.S. this is called a
billion – almost everywhere else it is a milliard. We use G to avoid confusion. M is for million. The
universe is about 13G years old.
eV are
electron-volts; and
electron has a mass-energy (E=mc
2, remember) of 0.511 MeV.
rad =
radiation, CBR=
cosmic background radiation,
QSO=quasars, BH=
Black hole, Msun= mass of our Sun.
A.U. is
astronomical units (Sun-Earth distance, = 8 light-minutes); pc is
parsecs: 2.36 light-years.