I first read about this ages ago as a kid and was fascinated. I never figured it was probable though. Years later I'm finding it more and more likely in my comp

I first read about this ages ago as a kid and was fascinated. I never figured it was probable though. Years later I'm finding it more and more likely in my completely worthless and undereducated opinion. It'd be crazy to eventually find out that many planets out there have similar DNA. I read something by a SETI researcher that pointed out that some research focuses on finding DNA outside of earth (e.g. Mars) that has the reversed chirality of DNA on earth (i.e. corkscrews the opposite way of all life we've found on earth). This would be an incredibly strong indicator for life that actually came from somewhere else and wasn't just contaminated from DNA from earth that got on the equipment. They said "strong" instead of "certain" as it's still possible for a "shadow biome" on earth where the chirality is reversed that we just haven't found yet. This is important as there is no reason that it should be one way or the other (at least that scientists are currently aware of). As far as they can tell it should be 50:50, so chirality makes for an interesting indicator. Note: this is what I read over a decade ago. I'm no biologist.