Announcements. Homework 13 due Wednesday Projects due Friday No office hour tomorrow (Tuesday) at 10 am; I will be available after 1 pm. The Cosmic Background Radiation. 27 November 2006. Today :. The cosmic background radiation Discovery Explanation Detailed features.
27 November 2006
Nearly perfect thermal spectrum, T = 2.735 K
Hotter by 1 part in 770 toward Leo; cooler by 1 part in 770 toward Aquarius. Conclusion: We’re moving toward Leo at 1/770 the speed of light (390 km/s), with respect to the average motion of the rest of the stuff in the observable universe.
After subtracting out the effect of our motion and the foreground radiation from our galaxy, we’re left with tiny variations of 1 part in 100,000. These are slight variations in the density of the hot gases that filled the early universe!
Background radiation (3000-degree ionized gas)