The birth of life on Earth is one of the greatest puzzles to have faced scientists, but some are starting to question whether it was even born here at all.
Astrobiologists are collecting growing evidence that suggests life may have begun elsewhere in the galaxy and was carried here by meteorites or comets around 3.8 to 4 billion years ago - a theory known as panspermia.
For example organic molecules and water have been found on comets racing through our solar system, suggesting the materials needed to kickstart life on Earth came from space.
And it's possible that this extraterrestrial 'seeding' may have even been "directed." To read more, click here.