The nebular hypothesis says that the Solar System formed from the gravitational collapse of a fragment of a giant molecular cloud. The cloud was about 20 parsec (65 light years) across, while the fragments were roughly 1 parsec (three and a quarter light-years) across.
ð ə WORD_BOUNDARY n ɛ b j ʊ l ə ɹ WORD_BOUNDARY h aɪ p ɑ θ ə s ɪ s WORD_BOUNDARY s ɛ z WORD_BOUNDARY ð æ t ð ə WORD_BOUNDARY s oʊ l ə ɹ WORD_BOUNDARY s ɪ s t ə m WORD_BOUNDARY f ɔ ɹ m d WORD_BOUNDARY f ɹ ʌ m ð ə WORD_BOUNDARY ɡ ɹ æ v ɪ t eɪ ʃ ə n ə l WORD_BOUNDARY k ə l æ p s WORD_BOUNDARY ə v ə WORD_BOUNDARY f ɹ æ ɡ m ə n t WORD_BOUNDARY ə v ə WORD_BOUNDARY d̠ʒ aɪ ə n t WORD_BOUNDARY m ə l ɛ k j ʊ l ə ɹ WORD_BOUNDARY k l aʊ d WORD_BOUNDARY ð ə WORD_BOUNDARY k l aʊ d WORD_BOUNDARY w ʌ z WORD_BOUNDARY ʌ b aʊ t WORD_BOUNDARY t w ɛ n t i WORD_BOUNDARY p ɑ ɹ s ɛ k WORD_BOUNDARY s ɪ k s t i WORD_BOUNDARY f aɪ v WORD_BOUNDARY l aɪ t WORD_BOUNDARY j ɪ ɹ z WORD_BOUNDARY ə k ɹ ɑ s WORD_BOUNDARY w aɪ l WORD_BOUNDARY ð ə WORD_BOUNDARY f ɹ æ ɡ m ə n t s WORD_BOUNDARY w ɜː WORD_BOUNDARY ɹ ʌ f l i WORD_BOUNDARY w ʌ n WORD_BOUNDARY p ɑ ɹ s ɛ k WORD_BOUNDARY θ ɹ iː WORD_BOUNDARY æ n d WORD_BOUNDARY ʌ WORD_BOUNDARY k w ɔ ɹ t ə ɹ WORD_BOUNDARY l aɪ t j ɪ ɹ z WORD_BOUNDARY ə k ɹ ɑ s WORD_BOUNDARY