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physical object > artifact > device > instrument > artificial satellite > unmanned spacecraft

unmanned spacecraft
subject			fact

unmanned spacecraft	has crew none
	has definition an artificial satellite without a crew
	is a kind of artificial satellite
artificial satellite	has attitude control
	has ground communication station
	can have orbit decay date
	has launch vehicle
	has launch location
	has launch date
instrument	has operator
satellite	orbits a more massive physical object
	has approximately elliptical orbit
	has orbital period
	has orbital inclination
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material
artifact	has creator
	has creation date
	has purpose
	has owner

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