A small comet orbits the sun at an average distance, a, of 3.25 AU (Astronomical Units). The closest distance it gets to the sun is d = 0.90 AU. Using the formula below, find how elongated (e) the orbit is.
d = a (1 - e)
d = 0.90 AU
a = 3.25 AU
(1-e) = d/a = 0.9/3.25 = 0.276923
e = 1-0.276923=0.723077 = 0.724
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