Answer:
Answer 1: One can learn all sorts of interesting things about the cosmological history of our universe from the angular spectrum of the cosmic background radiation.
Answer 2: Atoms, molecules, and dust particles floating in in, however, would reach an equilibrium temperature with the cosmic background radiation left over from the Big Bang
Answer 3: Updates to this second edition include new results from the Mars Express orbiter, the Spirit rover, and the Wilkinson Microwave Anistropy Probe on cosmic background radiation.