If gravity alone acts to retard the expansion and nothing acts to ...

[KWilfred]

If gravity alone acts to retard the expansion and nothing acts to accelerate it, the Universe is said to be closed if I. gravity is strong enough to stop the expansion in a finite time. II. the density of the Universe is less than the critical density. III. the Universe is finite.
 
  a. I & II
  b. I & III
  c. II & III
  d. I, I, & III
  e. None of the other choices are correct.

Question 2

The spectra of Type II supernova contain no hydrogen lines.
 
  a. True
  b. False
  Indicate whether the statement is true or false

[paavo]

Answer to Question 1

b

Answer to Question 2

False

[KWilfred]

Thank you!

[paavo]

Always glad to help...