Cosmic Panspermia: Life on Earth Seeded from a Cosmic Reservoir

To the point

Chandra Wickramasinghe and colleagues argue that life on Earth began not in situ but was seeded from space by comets, with microorganisms carried by comets and dispersed through interstellar dust potentially enabling Darwinian evolution on a cosmological scale, a view that predicts organic and biological material in comets and is supported by meteorite studies and earlier work by Fred Hoyle and others, though contamination concerns remain and further verification is needed.