Spectral lines are often referred to as the stars' fingerprints because:

Spectral lines are often referred to as the stars' fingerprints because:
 
  A) fingerprints also consist of individual lines that make a pattern.
  B) both are unique to their source.
  C) both can be easily categorized.
  D) both are characteristic of the individual that produced them.
  E) All of these are correct.

Question 2

Studies by the Global Oscillations Network Group, along with satellite observations, indicate
 
  A) that the standard solar model requires substantial modification.
  B) that all stars show the same kind of vibrations that our Sun does.
  C) that there is an unknown energy transport mechanism in the Sun.
  D) that there is less convection in the Sun than predicted by the standard solar model.
  E) that the standard solar model accurately models the observed solar vibrations.

Question 3

What is the greatest mass a newborn star can have
 
  A) 10 solar masses.
  B) 20 solar masses.
  C) 50 solar masses.
  D) a few hundred solar masses.

Question 4

The outward pressure of hot gas in the Sun
 
  A) is balanced by the inward gravitational pressure.
  B) is increasing the Sun's diameter.
  C) is cooling the photosphere.
  D) is responsible for variations in the sunspot cycle.
  E) weakens the magnetic field.