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I can't provide 100% certainty that human life on Earth is the result of intelligent design. But I can get to around 99.99% certainty.
By intelligent design, I mean Earth is seeded with DNA provided by human-like inhabitants of another planet.
I'm borrowing my argument from others. None of this is original, and I've written about it before. What's new is that we're getting close to being able to seed another planet with our own DNA. And there's talk of doing just that
because there's a non-zero chance that humans of the Earth variety won't survive unless we seed other planets.
I imagine we'd launch one big rocket into space that would leave the atmosphere and divide into thousands of small rockets that can make tiny adjustments to their direction but otherwise use the inertia of the mother rocket as propulsion. These tiny rockets can scan planets on the fly for earthlike properties and navigate toward ones that look promising, ending in a parachute landing.
If we decide to seed other planets with our DNA, which seems inevitable, it's likely we'd send thousands of seed rockets, not one. Sending one rocket would be a bad bet.
And since scientists are already talking of doing something like that now, and apparently we will have the ability to do so, it stands to reason that our genetic spawn on those planets will someday evolve to have the same impulses and capabilities. Then they will send out their own DNA seed ships.
So the odds are that planet-seeding will happen not once but thousands if not millions of times as one seeded planet begets thousands of others and so on.
We have no reason to believe we're the original humans. Sure, we evolved from lower creatures, but that might have been exactly how the seeding works. You start with the lower forms of creatures and let them evolve until humans have plenty to eat when they come along later. That's how I'd play it.
Or maybe the dinosaurs were seeded by some alien species whereas mammals came from human-like aliens. There are lots of possibilities.
What seems least likely is that we're the first humans on the first planet with an original idea about seeding other planets. It's far, far, more likely we're somewhere in the middle of the trend. We might be one of thousands or one of millions of planets seeded.
You might be tempted to quibble with the timing of things. But perhaps evolution on the newer planets is sped up by the designers. The original humans might have taken a billion years of evolution to arrive. By the hundredth iteration of humans seeding humans, perhaps the process has been compressed to a million years. That seems within the realm of possible.
So I say there's a 99.99% chance we are the result of past seeding by earlier humans. If you still believe we're the first, perhaps that is a case of feeling special more than a case of rational thought.
What's wrong with this line of reasoning?
1. The seeders couldn't guarantee creating humans just like us. But we know, for example that eyes evolved in at least two separate lines of evolution on earth. I'll bet intelligence is also likely to increase over time in at least one species. And once intelligent, that creature would need less speed and strength and even hair covering. So I think evolution might create weak, hairless, intelligent creatures with eyes as often as not. Add some symmetry and limbs and you're close enough.
I allow the possibility that the race seeding us looked more a customer in a Star Wars bar scene than like Brad Pitt. Close enough.
2. I'm surprised how many people think we won't ever have the technology to launch rockets that can sniff out the remote signature of habitable planets. Not in a thousand years? Really?
3. As to whether we would be motivated to seed other planets, all you need is one billionaire who wants to give the universe a facial. You think that guy won't exist in the next thousand years?]