不定项选择题：天文学家新发现了太阳系外一颗行星。这颗行星的体积是地球的4.7倍，质量是地球的25倍。已知某一近地卫星绕地球运动的周期约

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天文学家新发现了太阳系外一颗行星。这颗行星的体积是地球的4.7倍，质量是地球的25倍。已知某一近地卫星绕地球运动的周期约为1.4小时，引力常量G=6.67×10-11N•m2/kg2,由此估算该行星的平均密度约为 A．1.8×103kg/m3
B．5.6×103kg/m3
C．1.1×104kg/m3
D．2.5×104kg/m3

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