If WIMPs really exist and make up most of the dark matter in ...

[809779]

If WIMPs really exist and make up most of the dark matter in galaxies, which of the following is not one of their characteristics?
 
  A) They travel at speeds close to the speed of light.
  B) They are subatomic particles.
  C) They can neither emit nor absorb light.
  D) They tend to orbit at large distances from the galactic center.

Question 2

For what type of object is the period-luminosity relation used for determining distances?
 
  A) RR Lyrae variables
  B) T Tauri variables
  C) Cepheids
  D) Cataclysmic variables
  E) Planetary nebulae

[cadimas]

Answer to Question 1

A

Answer to Question 2

C

[809779]

TY

[cadimas]

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