Square I think "just as" is an adverb here which means "equally well" 'Just' is the adverb. 'As well [on the moon as in lower orbit] is the truncated comparative phrase.
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Square I think "just as" is an adverb here which means "equally well"'Just' is the adverb. 'As well [on the moon as in lower orbit] is the truncated comparative phrase.