PCS 181 Lecture Notes - Cosmic Microwave Background, Cosmic Background Explorer, Cosmological Principle
All galaxies are red shifted and are receding from us. Radial velocity of a galaxy is directly proportional to distance. Ho = vr/d: the universe is expanding space itself is expanding. They were in charge of signal of first communications satellite (telstar) Detected a persistent radio hiss from all directions in the sky. This had a wavelength of = 1. 063*10^-3m. They found the temperature of the source. This was determined using the wein formula. This temperature is the resonate heat left over from the big bang. Proving that some event must have heated the universe. Penzius and wilson discovered the remnant heat from the birth of the universe: the universe is expanding (hubble and humason) Pcs 181: there was a heat event at the beginning of space and time as proven by the cmb (penzias and wilson) 1989 cosmic background explorer satellite (cobe) was launched in order to figure out the temperature of space.