Aliens May Have Started Life on Earth — A Scientist Offers Evidence
Could life on Earth have cosmic origins or intelligent extraterrestrial interference? A closer look at panspermia theories.
The Theory Is Called Panspermia
Directed Panspermia Goes Further
The Main Puzzle Is Timing
Fragile Molecules Make the Problem Harder
Space Already Carries Life’s Ingredients
Panspermia Does Not Fully Solve the Mystery
The Alien Version Is the Most Speculative
Abiogenesis Still Leads Mainstream Science
Future Tools May Change the Debate
The Real Story Is About Scientific Humility
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The idea that aliens may have started life on Earth sounds like pure science fiction. It suggests a universe where life did not simply arise in a warm pond, deep-sea vent, or ancient chemical environment, but arrived here from somewhere else. Even more dramatically, one version of the idea proposes that intelligent beings may have deliberately seeded Earth with life.
This is not the mainstream explanation for life’s origin. Most scientists still focus on abiogenesis, the idea that life emerged naturally from non-living chemistry on the early Earth. But biologist Robert Endres of Imperial College London has argued that the odds of life forming so quickly may be stranger than we assume, leading him to revisit directed panspermia — a controversial idea once proposed by Francis Crick and Leslie Orgel.