The Big Bang. Where do we come from, where are we going?. Goals. What’s the cosmological principle? Where did things begin? Where will things end? What’s the temperature of space?. Hubble’s Law. Recall: All galaxies are moving away from us. The farther away the faster they go.
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The Big Bang
Where do we come from, where are we going?
You Are Here
Farther away we look, further back in time we see!
Every line of sight should end at the surface of a star.
time = distance / velocity
velocity = Ho x distance
time = distance / (Ho x distance)
time = 1/Ho
T ~ 15 billion years
Dividing line is the critical density.
Wo is the ratio of measured density to the critical density.
If Wo > 1then closed, Wo < 1 then open.
Satellite measured the intensity of energy from space at a range of frequencies.
10 x more energy in background than everywhere else.