ch27 -...

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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.  1) 
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What is the  upper limit  of stars the  unaided eye  can discern  on a  moonless  night in a  rural area? 
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1)  _______  A) 
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About 300,000 
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B)  About  3,000,000 
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About 3,000 
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D)  About  30,000    2
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The diurnal  rotation of  the stars  refers to the 
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2)  _______  A)  r a t e   o f   s p i n  of  sta rs  in  the ir  for ma tio sta ge.  a p p a r e n r otation of  the  celestial  sphere  due to  the  rotation  of the  Earth. 
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particular constellations  that are visible in different times of the year.  D) 
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movement of the stars  across the sky during daytime hours.    3) 
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The North  Star has very  little  apparent  rotation in  the night sky  because 
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3)  _______  A)  i t   l i e s   d i r e c t l y   i n   t he  No rth ern  pat of  the  pro jec tio of  the  Ear th's  axi of  spi n.  it r at e of spin  directly  matches  Earth's. 
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it rotates in the same  relative orbit as Earth.  D) 
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the Oort cloud distorts  the view of the naked eye.    4) 
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Which best  describes the  intrinsic  motion of  stars? 
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4)  _______  A)  T h e i r   c i r c u l a r  m oti on  acr oss  the  sky  in  24 - ho ur  per iod  T h ei m otion  relative  to all  other  bodies 
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Their apparent yearly  cycle around the Sun, due to Earth's revolution  D) 
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Their motion relative to  Earth    5) 
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How far is a  light year? 
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5)  _______  A)  T h e   d i s t a nce  of  on Ear th  orb it.  N e a rly 10  trillion  km 
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300,000 km  D) 
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All of the above    6) 
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In what  sense do we  say we are  looking back  in time when  we are  looking at  the stars? 
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6)  _______  A)  B e c a u s e   s p a c e   c u r v e s ,   w are  act ual ly  loo kin at  the  pas wh en  we  loo in  the  nig ht  sky B e c a u s Earth's  atmosphe re bends  and  distorts  their  light. 
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We see stars as they  once were when their light reaches us.  D) 
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Because stars are  emitting immense radiation, we are seeing processes that have already happened.    7) 
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Summer and  winter  constellation s are  different  because 
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7)  _______  A)  t h e   u n i v e r s e is  sy m me tric  an har mo nio us.  o t h tilt of the  Earth's  polar  axis. 
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the night sky faces in  opposite directions in summer and winter.  D) 
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ch27 -...

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