space travel 1
noundomain: activity
Princeton WordNet [ver.3.1]
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EnglishDefinition
a voyage outside the Earth's atmosphere
Hypernym
voyage 2
noun
a journey to some distant place
EnglishMember_of_this_domain_-_TOPIC
gravity-assist 1
noun
(spaceflight) a trajectory that passes close to a planetary body in order to gain energy from its gravitational field
