¬ÝªO: astronomy ¡· ¤Ñ¤åª¾ÃÑ    ªO¥D: vega1
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µo«H¤H: glesses1991.bbs@ptt.cc (yo) ¬ÝªO: astronomy
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µo«H¯¸: §å½ð½ð¹ê·~ (2013/06/28 Fri 16:26:08)

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1.the structure of a comet can be described in five distinguishable parts.list these five components in order of their physical size.
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2.a particular star in a binary star system orbits the other in an elliptical orbit with a semi-major axis 3AU and a period of 5 years.what is the sum of the masses of the two stars in the system?

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