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firmament
mastery UK /ˈfɜːməm(ə)nt/ US /ˈfɝməmənt/noun
card 1 of 10 · fill in the blank
The telescope allowed astronomers to _____ the firmament in unprecedented detail.
card 1 of 10 · fill in the blank
The telescope allowed astronomers to _____ the firmament in unprecedented detail.