Panspermia: the theory that life was sent to Earth by aliens

We often wonder whether there are aliens on other planets but what if we ourselves are aliens on the planet we call home?

Panspermia, the “controversial” theory that life “began elsewhere in space” and was “delivered to Earth on comets and asteroids”, is gaining new traction, said BBC Science Focus .

Building blocks of life

New analysis of asteroid rocks brought back to Earth by Japanese and Nasa -led space missions suggests a presence of some of the building blocks of life – which could mean that those “same building blocks”, and “perhaps even primitive microbial life”, could have been delivered to Earth on other asteroids or comets billions of years ago, said BBC Science Focus.

Scientists examining the rock samples have found carbon, ammonia, salts, 14 of the 20 amino acids neede