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Stars and Galaxies

Practice Test
      
  1.Prominence, or huge arching columns of gas, are thought to be caused by__________.  
  a.   the rotation of the galaxy  
  b.   Earth's magnetic field  
  c.   the Sun's rotation  
  d.   the magnetic field associated with sunspots  
  Hint    
      
  2.Once stars run out of hydrogen and the temperature begins to increase, these stars are said to be __________.  
  a.   a galaxy  
  b.   a giant  
  c.   a white dwarf  
  d.   a supernova  
  Hint    
      
  3.What holds planets, stars, gas, and dust together in a galaxy?  
  a.   inertia  
  b.   friction  
  c.   forces  
  d.   gravity  
  Hint    
      
  4.By studying a star's spectra, scientists can determine __________ found in the star's atmosphere.  
  a.   clusters  
  b.   dust  
  c.   elements  
  d.   gases  
  Hint    
      
  5.Astronomers use a star's __________ to determine how far it is from Earth.  
  a.   parallax  
  b.   parallel  
  c.   size  
  d.   brightness  
  Hint    
      
  6.A binary system is composed of ___________ stars.  
  a.   five  
  b.   four  
  c.   two  
  d.   three  
  Hint    
      
  7.__________ is the process that creates energy in the sun.  
  a.   Parallax  
  b.   Fission  
  c.   Fusion  
  d.   Blue shift  
  Hint    
      
  8.When fusion occurs, the mass lost is converted into __________.  
  a.   mass  
  b.   energy  
  c.   liquid  
  d.   matter  
  Hint    
      
  9.Another way to define "nebula" is __________.  
  a.   exploding star  
  b.   dying star  
  c.   young star  
  d.   old star  
  Hint    
      
  10.What does CME stand for?  
  a.   Central Mass Ejections  
  b.   Coronal Mass Ejections  
  c.   Coronal Mass Emissions  
  d.   Coronal Materials Ejections  
  Hint    
      
  11.Why are circumpolar constellations visible all year long?  
  a.   because they are the closest  
  b.   All constellations are visible all year long.  
  c.   because they are the brightest stars  
  d.   because they are located directly above the North Pole  
  Hint    
      
  12.An aurora, like the aurora borealis is caused by  
  a.   solarwind  
  b.   solar flares  
  c.   CME's  
  d.   particles from solar flares  
  Hint    
      
  13.When stars are located closer to one another, their attraction to one another increases due to __________.  
  a.   their weight  
  b.   their temperature  
  c.   their age  
  d.   gravity  
  Hint    
      
  14.Which, if any, of the three types of galaxies occur the most often?  
  a.   They occur in equal amounts.  
  b.   spiral  
  c.   elliptical  
  d.   irregular  
  Hint    
      
  15.When a star becomes a supernova its brightness __________.  
  a.   doesn't change  
  b.   vanishes  
  c.   decreases  
  d.   increases  
  Hint    
      
  16.Energy produced by the sun reaches the Earth through _________.  
  a.   conduction  
  b.   convection  
  c.   convection and radiation  
  d.   radiation  
  Hint    
      
  17.Particles that escape from the sun's __________ move through space as solar wind.  
  a.   surface  
  b.   corona  
  c.   chromosphere  
  d.   photosphere  
  Hint    
      
  18.The __________ __________of a star is a measure of the amount of light it gives off.  
  a.   absolute solitude  
  b.   apparent magnitude  
  c.   absolute magnitude  
  d.   apparent strength  
  Hint    
      
  19.Fusion occurs when __________ and __________ combine to make energy.  
  a.   carbon, oxygen  
  b.   hydrogen, helium  
  c.   carbon, helium  
  d.   hydrogen, oxygen  
  Hint    
      
  20.Circumpolar constellations __________.  
  a.   appear to circle around the North Star as the Earth rotates.  
  b.   are always located above the North Pole.  
  c.   are located in a circular constellation.  
  d.   never appear around the North Pole.  
  Hint    

 
   
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