The tail of a comet is primarily caused by A) radiation ...

[danielfitts88]

The tail of a comet is primarily caused by
 
  A) radiation pressure.
  B) electromagnetic induction.
  C) Coulomb repulsion.
  D) eddy currents.
  E) nuclear magnetism.

Question 2

Approximately how soon might we expect an immediate response from a civilization that received the signal we sent to the globular cluster M13 (21,000 light-years away) in 1974?
 
  A) 84,000 years
  B) 21,000 years
  C) 10,500 years
  D) 42,000 years

[lorealeza77]

Answer to Question 1

A

Answer to Question 2

D

[danielfitts88]

Both answers were spot on, thank you once again

[lorealeza77]

Great! Please up vote