Panspermia Under Scrutiny: Debates, Evidence, and the Search for Cosmic Life
To the point
Panspermia is the idea that life on Earth may come from space, but it remains unproven and debated, with Fred Hoyle and Chandra Wickramasinghe arguing for cosmic seeding and William Leving and J. William Schopf urging rigorous testing, and even if life travels between worlds, extraordinary evidence and flexible metabolisms would be needed.