
 Astronomy A Final Examination 1997 (Site not responding. Last check: 20071021) 
  ======================================================================e,c,b,c or e,c 81 Aberration of starlight is a) reddening of starlight by the earth’s atmosphere, b) reddening of starlight by the interplanetary medium, c) associated with the problem of the regression of the apsides, d) explained in the Principia, e) caused by the orbital motion of the earth. 
  This distance is known as (a) the tidal boundary, (b) the Roche limit, (c) the density gradient, (d) the inverse cube law of tides, (e) Browne's theorem. 
  The diameter is 2705 km and (a) the relative uncompressed density is nine times that of water, (b) it has the largest known volcano in the solar system, (c) it has a retrograde orbit, (d) the orbital eccentricity is 0.75, highest of any large moon, (e) it lies just within the limit of tidal stability. 
 www.physics.uq.edu.au /people/ross/phys2081/223f97.htm (911 words) 
