The period-luminosity relation is critical in finding distances with:

The period-luminosity relation is critical in finding distances with:
 
  A) RR Lyrae stars.
  B) trigonometric parallaxes.
  C) spectroscopic parallaxes.
  D) Cepheid variables.
  E) pulsars.

Question 2

Which of the following is farthest from the Sun?
 
  A) Pluto
  B) Neptune
  C) an asteroid in the asteroid belt
  D) a comet in the Kuiper belt
  E) a comet in the Oort cloud

Question 3

If a star is spinning rapidly, this may limit its final mass.
 
  Indicate whether the statement is true or false

Question 4

Gravity becomes separate from the other forces at the:
 
  A) decoupling Event, about a million years after the Big Bang.
  B) end of the Planck Era, about 10-43 seconds after the Big Bang.
  C) end of the Inflationary Epoch, about 10-32 seconds into creation.
  D) beginning of particle production, about .0001 seconds into the universe.
  E) end of electron production, about a minute after creation.