Kakawitin pinaka unteng pra-bintang kompak utawi nebula gelap, sané makonsentrasi miwah rubuh (ring volume sané katentuang olih  Jeans lantang) anggé ngwentuk protobintang kompak.
These begin as a compact pre-stellar core or dark nebulae, which concentrate and collapse (in volumes determined by the Jeans length) to form compact protostars.