<prompt> unaweza kugeuza matini haya ya swahilikwa kiingereza?wanaastronomia wengi wanaamini kuwa ulimwengu ulianza na milipuko mkubwa uitwao big bang miaka bilioni 13.7 iliyopita.  <response>: scientists believe the universe began in a hot big bang about 13,600 million years ago. 