Is the title(and claim) of a new paper published in Cosmology.
A comprehensive theory is presented to explain how life on Earth originated from other planets. Life appeared a few hundred million years after the Earths creation during a period of heavy bombardment. Life on Mars may have appeared near the same time. Microbes are adapted for surviving the hazards of space, including ejection from and landing upon a planet. Microbial fossils have been discovered in fifteen carbonaceous chondrites, most impacted by supernova. The Sun and Earth were created from a nebular cloud and protoplanetary disc, the remnants of an exploding star and its planets which may have harbored life. When the parent star became a red giant, its solar winds blew away planetary atmospheres along with airborne microbes, which were deposited in a growing nebular cloud. Because the red giant lost 40% to 80& of its mass and its gravitational influences were reduced, its planets increased orbital distances or were ejected prior to supernova and may not have been atomized. The inner layers of a nebular cloud and protoplanetary disk protects against radiation and extreme cold enabling spores to survive. Microbes may have also survived within planetary debris which bombarded the Earth. As only life can produce life, then life on Earth also came from life which may have originated on planets which orbited the parent star.
And the conclusion:
Our sun and solar system were created from the nebular debris spawned by a red giant which exploded in a supernova, nearly 5 billion years ago. The sun and our solar system may have been created within 100 million years of this explosion.
Spores can survive from 250 to 600 million years; which is more than enough time to take up residence on planets made up of this debris. Bacteria are perfectly adapted for surviving the hazards of space, and could not have acquired these abilities if their ancestral experience had been confined to Earth.
Life on Earth appeared while this planet was still forming. There is no proof life can be created from non-life. As only life can produce life, only panspermia is a viable scientific explanation as to the origin of Earthly life. The first life forms to appear on Earth were produced by other living creatures who were likely encased in debris ejected by the parent star nearly 5 billion years ago.
Life on Earth, came from other planets.
I've not made it through the entire paper just yet but rest assured this will stir some discussion.