Space-time will be flat if a. the Universe is expanding. b. ...

[Beheh]

Space-time will be flat if
 
  a. the Universe is expanding.
  b. the Universe is accelerating.
  c. the average density of the Universe is equal to the critical density.
  d. the Universe is finite.
  e. the Universe is homogeneous and isotropic.

Question 2

The helium core flash occurs in very high mass stars.
 
  a. True
  b. False
  Indicate whether the statement is true or false

[s.meritte]

Answer to Question 1

c

Answer to Question 2

False

[Beheh]

Thanks for the timely response, appreciate it

[samiel-sayed]

Gracias!