| http://www.w3.org/ns/prov#value | - ???Sky-Sailor was designed as a prototype flying on Earth to prove that continuous flight is feasible on Mars (by flying at altitude were air density is comparable, for example),??? Noth explained. ???In fact, many challenges remain, such as the fact that, at the very low temperature on Mars, the battery would have a highly reduced capacity if not heated and maintained at more than 0-10??C. Moreov
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