I've mentioned panspermia before. It's the idea that life may have originated on other planets (possibly Mars) and was transferred to Earth via a meteor. According to the Guardian, scientists have discovered that life could theoretically survive the devastating events surrounding being flung into space and landing on another planet. An extract:
The researchers...used high explosives to fire a steel plate at the sandwiched organisms and after each shot transferred the microbes to a dish to see if any had survived. The shocks were equivalent to those suffered by Martian meteorites that have been found on Earth, with pressures of up to 50 billion pascals. One pascal is equivalent to the pressure exerted by a £5 note resting on a surface. The pressure in a car tyre is equivalent to 200,000 pascals.
To their surprise, the scientists found the lichen and bacterial spores survived all but the most cataclysmic impacts up to 45 billion pascals. The cyanobacteria survived shocks of up to 10 billion pascals.
It's certainly an interesting idea that life began elsewhere and was transferred to Earth via a meteor (like a space-born bumblebee). I do think, however, that since life is so abundant on our own planet, that perhaps it is the most obvious and simplest answer which is correct: that terrestrial life originated here on Earth (and not in the garden of Eden).
Maybe we're alien sperm from another planet, or terrestrial born and bred. But wherever the life on Earth did first evolve, without those ancient ancestors, none of us would be here today!Go Top