Astronomers have reached a fundamental impasse in their understanding of the universe: they cannot agree how fast it is flying apart. And unless a reasonable explanation can be found for their differing estimates, they may be forced to completely rethink their ideas about time and space. Only new physics can now account for the cosmic conundrum they have uncovered, many believe.
Is "many belive" a main clause and Only new physics can now account for the cosmic conundrum they have uncovered a content clause functioning as a complement of the verb "believe" in the last sentence of the paragraph above?
" The word "that" is omitted, and the word order is rearranged, for stylistic reasons. "
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The last sentence is actually: "Many believe that only new physics can now account for the cosmic conundrum they have uncovered." The word "that" is omitted, and the word order is rearranged, for stylistic reasons. The group of words, "that only new physics can now account for the cosmic conundrum they have uncovered ", functions as a noun, serves as the direct object of the verb "believe."