A billion solar mass black hole has a radius of only:
A) one solar diameter.
B) 20 A.U.
C) 400 A.U.
D) 3 parsecs.
E) 20 parsecs.
Question 2
Nearly all the elements found in nature were formed inside stars, EXCEPT for:
A) carbon and silicon.
B) hydrogen and helium.
C) helium and carbon.
D) silver and technetium.
E) uranium and radium.