Fly through planets
Embedded Files
Audio Guide：
Objects of different mass will exert distinct levels of gravitational force. Thus, planets that differ in mass will also vary in their gravitational field. When a celestial object or man-made probe passes near a planet, the planet’s course of motion will be altered by the object’s gravitational pull.
Exhibit Introduction：
Mechanical interactive device is provided for the visitors to know the gravitational field of planets and the principle of gravity aid when the space shuttle travels around planets via an interesting way.
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