The comet theory gets a fairly narrow landing window in these simulations. Space may deliver the ingredients, but Earth still has to do the cooking. https://www.smithsonianmag.com/smart-news/what-seeded-life-on-earth-new-research-challenges-the-longstanding-theory-that-comets-brought-the-ingredients-to-our-planet-180989852/By Callum Fraser, Nov 12, 2026. 4 likes, 0 comments.