TEXTO PARA AS QUESTÕES DE 56 A 58 As astronomers gaze into the depths of space, they do so with unease: They don't know precisely what the universe is made of. Surprisingly, no one knows the stars' exact chemical composition: how many carbon, nitrogen and oxyg…
Conforme o texto, um critério tradicionalmente utilizado por astrônomos para avaliar estrelas envolve
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