精彩着陆翱翔号宇宙飞船在地球卫星轨道上运行,小灵通关闭了飞船的动力系统,让它靠着惯性和地球的引力,像地球卫星似地围绕着地球旋转。雪莺望着窗外,“瞧,我们的地球像个蓝色的大鸭梨。”“正好90分钟,正好90分钟。”火星高声说。“又在说呆话!什么正好90分钟?”比比波不解地问。“这都不明白,”小灵通不屑地说,“我们在地球轨道上运行,90分钟左右就有一次日出日落。” Splendid landing Soaring spacecraft in orbit the Earth’s satellite orbit, PHS closed the spacecraft’s power system, let it rely on inertia and the Earth’s gravity, like earth orbit around the earth like satellite rotation. The snowy eagle looks out the window. “Look, our earth looks like a blue pear.” “Just 90 minutes, exactly 90 minutes.” “Just talking again! What exactly 90 minutes?” Bibbo puzzled to ask. “This does not understand, ” PHS disdain said, “We are in orbit around the earth, there is a sunrise and sunset about 90 minutes. ”