Dubhe Megrez 81 ly 105 ly Mizar 73 ly Alioth Merak 64 ly 77 ly Alkaid Phad 138 ly 80 ly
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All of the stars of the Big
Dipper (part of the constellation Ursa Major) may appear to be the
same distance from the earth, but in fact they are very far from each
other. Figure shows the distances from the earth to each of
these stars. The distances are given in light-years (ly), the distance
that light travels in one year. One light-year equals 9.461 * 1015 m.
(a) Alkaid and Merak are 25.6 apart in the earth’s sky. In a diagram,
show the relative positions of Alkaid, Merak, and our sun. Find the
distance in light-years from Alkaid to Merak. (b) To an inhabitant of
a planet orbiting Merak, how many degrees apart in the sky would
Alkaid and our sun be?
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