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Stars and Galaxies

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

 
   
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