DNA's survival of space travel hit the news this week.
|DNA in Spaaaaaaaaaace!|
Of course that still leaves the problem of origin with regards to that life, but I guess this at least kicks the can down the road a bit, huh?"
"sonofEinstein" has a great reply to Scientific American's story on "DNA Surviving Entry from Space.
"What a piece of nonsense "science". This from a mere 13 minutes in flight?? The problem is that 98% of all of the meteors that have hit Earth, according to NASA have originated in the asteroid belt and are of the original materials that built the Earth. At the average speed of a meteor, it would take about a year to reach Earth. This would mean traveling through space where the temperature is about 10 degrees Kelvin. Since all life has to have carbon and oxygen to survive, this would mean it would be frozen before it reached the atmosphere of Earth. That is when it hits the Van Allen Belts where the temperatures rise rapidly to 1,923 degrees Kelvin. So could DNA have survived THESE temperatures? Not like! Finally it would have had to survive the impact of actually crashing onto the surface of Earth, whether land or sea doesn't make a difference to the impact. Finally, we have NEVER found ANY evidence of life anywhere on any of the asteroids, including Vesta from which most of the meteors have come, and has been visited by the Dawn space probe in July 2011. For Life to have come on a comet, it would have to have been from the asteroid belt, which means that there would have to have been Life there some 4.54 billion years ago when they were formed at the same time as Earth. That leaves the prospect of DNA or some form of Life coming on board a meteor from further away, meaning somewhere else in our solar system - though we have no evidence of it from Voyager and other space probes, and since Life has been on Earth since 3.6 billion years, it would have LONGER to develop on one of those planets/moons - yet no sign yet either. That means if Life was a hitchhiker, it would have come from even further away, and only 2% of meteors on Earth came from this far away. But that would mean "life" would have had to travel 1,000 years before reaching Earth, all through dark space where the temperature is a mere 2.7 degrees Kelvin. So this "experiment" replicates NOTHING and is scientifically useless in the reality of our solar system!"
Good job Son of Einstein!