| http://www.w3.org/ns/prov#value | - They tend to be expensive and have limited range, and due to the communications time lags over interplanetary distances, they have to be smart enough to navigate without disabling themselves.For planets with atmospheres of any substance, however, there is an alternative: an autonomous flying robot, or aerobot Most aerobot concepts are based on aerostats, primarily balloons, but occasionally airs
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