PCS 181 Lecture Notes - Lecture 2: Scientific American, Alan Guth, White Dwarf

• School: Ryerson University
• Department: Physics
• Course: PCS 181
• Professor: Margaret Buckby

Document Summary

Hubble and humason determined the distances and radial velocities of faraway galaxies: the further the galaxy is from us , the faster it is moving ,they all moving away from us. >because the entire universe is expanding: all faraway galaxies are redshifted, the local group the galaxy groups that we are live in (about 40), some galaxy within the local group are moving towards us, hubble law: Radial velocity of a galaxy is directly proportional to distance. The age of the universe = hubble time. Vr = hod, where we use a hubble parameter of 75 km/s / mpc since d = vt, we replace d in above equation: > t = 1 / 75 km/s / mpc = 3. 09 10^19 km / 75 km/s. = 4. 12 10^17 s 13. 1 billion years hubble time = age of the universe. T=2. 728 0. 004k = cmb = temperature of empty interstellar space.