What two observable properties of a Cepheid variable are directly ...

[oliviahorn72]

What two observable properties of a Cepheid variable are directly related to one another?
 
  A) its luminosity and its mass
  B) the period between its peaks of brightness and its distance
  C) the period between its peaks of brightness and its luminosity
  D) its mass and its distance

Question 2

Einstein originally added a cosmological constant to his equations to prevent a presumably static universe from either contracting or expanding.
 
  Modern cosmologists have reintroduced it to their equations, where as the source of dark energy it causes the universe to expand ever faster.
 
 
  Indicate whether the statement is true or false

[livaneabi]

Answer to Question 1

C

Answer to Question 2

TRUE

[oliviahorn72]

Both answers were spot on, thank you once again

[livaneabi]

Great! Please up vote