It's not as crazy as it sounds: life on Earth could be descended from space-faring microbes from Mars, or even further beyond, riding here on an interplanetary highway of asteroids. Extremophile bacteria may be resilient enough to survive the intense 3-stage journey, by repairing their own damaged DNA or hibernating for the long and deadly journey through space.
The chemistry of life could even be spreading across solar systems to other parts of the galaxy, connecting biologies together in a huge web of life. Could we be a part of an ancient cosmic family tree? What other creatures could this tree contain?
The chemistry of life could even be spreading across solar systems to other parts of the galaxy, connecting biologies together in a huge web of life. Could we be a part of an ancient cosmic family tree? What other creatures could this tree contain?