(S (S (BASENP (JJ Various) (NNS measurements)) (VP (VBP give) (NP (BASENP (DT a) (JJ good) (NN estimate)) (PP (IN of) (NP (NP (NP (BASENP (DT the) (NN mass-density)) (PP (IN of) (NP (BASENP (NNS baryons)) (PRN (COLON -) (NP (BASENP (DT the) (NNS neutrons) (CC and) (NNS protons)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP make) (PRT (RP up))) (NP (BASENP (DT the) (NNS nuclei)) (PP (IN of) (BASENP (NNS atoms) (CC and) (NNS ions)))))))) (COLON -))))) (PP (IN in) (BASENP (DT the) (NNP Universe)))) (ADVP (BASENP (QP (NN 10) (NN billion)) (NNS years)) (RB ago))))))) (PERIOD .))