article_snippet.sent: This is known as the giant impact hypothesis .
article_snippet.sent: The two theories appear in the journal Nature across three studies - two in favour of the ‘similar to Earth’ theory, and the other favouring the ‘shower of debris’ model.
article_snippet.sent: This is called the giant impact hypothesis.
article_snippet.sent: the giant impact hypothesis claims
article_snippet.sent: Dr Alessandra Mastrobuono-Battisti and colleagues simulated collisions between protoplanets and compared the composition of each surviving planet with the composition of each surviving planet last giant impactor.
article_snippet.sent: the moon also has a lower density compared to Earth, while there is evidence of similar collisions in other star systems (that result in debris disks).
article_snippet.sent: Giant collisions are also consistent with the leading theories of the formation of the solar system.
article_snippet.sent: the stable isotope ratios of lunar and terrestrial rock found that 20 to 40 per cent of impactors had similar compositions to the planets the stable isotope ratios of lunar and terrestrial rock impacted, whereas planets that formed in the same simulation tended to have distinct compositions.
article_snippet.sent: We find that different planets formed in the same simulation have distinct compositions, but the compositions of giant impactors are statistically more similar to the planets the compositions of giant impactors impact,’ the researchers wrote.
article_snippet.sent: the compositions of giant impactors said the compositions of giant impactors theory has a 20 per cent probability of correct.
article_snippet.sent: Dr Alessandra Mastrobuono-Battisti and colleagues simulated collisions between protoplanets to make Dr Alessandra Mastrobuono-Battisti and colleagues finding .