The discovery of the cosmic microwave background was important ...

[tuffie]

The discovery of the cosmic microwave background was important because
 
  A) its detection was a major advance in microwave testing.
  B) it was experimental verification of a prediction from the Big Bang theory.
  C) it showed the universe must be closed, with more than the critical density here.
  D) it established a firm center of the universe.
  E) it proved that astronomy at radio wavelengths was possible.

Question 2

What percentage of stars lie on the main sequence? Why?
 
  What will be an ideal response?

[kjo;oj]

Answer to Question 1

B

Answer to Question 2

About 90 of all stars are still fusing hydrogen to helium in their cores.

[tuffie]

Thanks for the timely response, appreciate it

[bigcheese9]

Excellent