The halo stars in our Galaxy are bright, upper-main-sequence stars. (True or false?)

The halo stars in our Galaxy are bright, upper-main-sequence stars.
 
  Indicate whether the statement is true or false

Question 2

Proper motion of a star is measured in meters.
 
  Indicate whether the statement is true or false

Question 3

O and B associations are poor spiral tracers.
 
  Indicate whether the statement is true or false

Question 4

Kiloparsec is a unit of sound.
 
  Indicate whether the statement is true or false

Question 5

The instability strip is the region of the H-R diagram in which stars are stable to pulsation.
 
  Indicate whether the statement is true or false