The decadal highlights three vast themes as the most pressing scientific questions for planetary scientists to address over the next decade: origins ("How did the solar system and Earth originate, and are systems like ours common or rare in the universe?"), worlds and processes ("How did plan...
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These groups could be expanded, for example by examining the socioeconomic properties of the areas from which travellers originate (in the manner of geo-demographic classifications). This would support probabilistic inferences of more nuanced and detailed trip purposes for a wider number of traveller ...