New research from ETH Zurich suggests that Earth formed almost entirely from inner solar system material. Isotopic evidence shows that less than 2% came from beyond Jupiter, challenging long-held theories about external contributions.<br /><br />This implies that Jupiter acted as a barrier early on—meaning key ingredients like water may have originated locally, reshaping our understanding of planetary formation.<br /><br />Thank you for listening to Bedtime Astronomy — your guide to the cosmos. New episodes on space exploration, NASA missions &amp; the latest astronomy breakthroughs.<br /><br />This episode includes AI-generated content.