Well, would you look at that: scientists have discovered that DNA can make it through the hellish ordeal of atmospheric re-entry after all. German and Swiss researchers dotted a rocket's grooves and screw heads with fragments of genetic blueprints to see how they'd fare in situations that could've led to the appearance of life on Earth.
Sounds like life is more resilient than some may have given it credit for. Hmmm....
I wonder if it might be worth designing a new rocket, meant to simply reach upper orbital levels, to come back down. I wonder how high a life form can live in what combination of conditions? Nothing in even a basic animal form, I'm sure... However, could a virus survive in the right conditions?
'Here lay the human race...survived everything, to include their own brush with nuclear weapons. Dead by the Galactic Flu trapped in an oversized snowball'
Post by Charles1952 on Nov 30, 2014 21:01:17 GMT -6
Now this is an experiment I can understand and which seems worthwhile. Oh, I see, it wasn't done by Americans, right then. But this won't resolve the issue, it just gets us on the right track for investigating these things.
One of the things I'm wondering about is the temperature the DNA was exposed to. The Scientific American article, which has the information, says the temperature on the rocket's re-entry reached 263o F.
That didn't seem very hot to me. So I did the most basic of searches for an elementary school article, and found this.
A meteor moving through the vacuum of space typically travels at speeds reaching tens of thousands of miles per hour. When the meteor hits the atmosphere, the air in front of it compresses incredibly quickly. When a gas is compressed, its temperature rises. This causes the meteor to heat up so much that it glows. The air burns the meteor until there is nothing left. Re-entry temperatures can reach as high as 3,000 degrees F!
lol... Fair enough... I don't think anything coming into the atmosphere at interstellar speed is going to be carrying anything left alive on it's surface.
It occurred to me though...Comets are largely Ice (or so it is suspected). If it's water ice or something else? Who knows what may be frozen inside the pieces which do survive as one occasionally crosses our path. It wouldn't have to be dramatic in size or any other way, really. Just enough for pieces to make it to the ground with something more than dead material under the surface.
Of course, the obvious issue rests with something less exotic, I'd imagine. Ever seen The Andromeda Strain? I didn't care for the remake. Kinda..over the top. Like most movies are these days. The original one leaves a person to ponder things a bit though, eh? Especially after seeing something from orbit could carry a piggy back on down.
Last Edit: Nov 30, 2014 22:03:48 GMT -6 by Deleted: Corrected film title
Post by Charles1952 on Nov 30, 2014 22:37:02 GMT -6
@wrabbit2000,
I think you're right about that. I see this as science's improved test of DNA survival. I would really like to see more of them. Do bacteria survive more readily than DNA? Do viruses?
Can we have something like a space shuttle mate with an ice ball, and insert DNA into the core by drilling into it, then pushing it towards earth?
This is stuff for which the world is (or should be) awaiting. Not because of the origin of life question. This won't resolve that question. The best it can do is say "Here is a way life on Earth could have begun." Not, "This is how life did begin."
My initial interest is in decontamination. Just as I don't like man leaving any germs out there, I don't want any of their germs down here. Maybe we'd just have to leave our exploration ships in orbit and carry the crew down on clean shuttles.