Theory of Intelligent Design, the best explanation of Origins

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Theory of Intelligent Design, the best explanation of Origins » Astronomy & Cosmology and God » Panspermia, not a viable explanation for the OOL

Panspermia, not a viable explanation for the OOL

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Panspermia, not a viable explanation for the OOL

http://reasonandscience.heavenforum.org/t1362-panspermia#1926 

Blank and her NASA team  claimed that amino acids can survive a comet’s entrance into Earth’s atmosphere and subsequent surface impact. But this  presents a big problem. Calculations and measurements show that both events generate so much heat (atmosphere = 500°+ Centigrade while the collision = 1,000°+ Centigrade) that they break down the molecules into components useless for forming the building blocks of life molecules. This was confirmed by NASA when they sent the Stardust Spacecraft to the comet 81P Wild in 2004 to recover samples, which were returned to Earth and analyzed for organic molecules. The only amino acid indisputably detected in the sample was glycine at an abundance level of just 20 trillionths of a mol per cubic centimeter

Life chemistry demands homochirality (same chirality). Proteins cannot assemble unless all the chiralamino acids (20 out of the 21 bioactive amino acids are chiral) are either 100 percent left-handed or 100 percent right-handed. Likewise, DNA and RNA molecules cannot assemble unless all pentose sugars are 100 percent left-handed or right-handed. All organisms on Earth manifest only left-handed chiral amino acids and right-handed  pentose sugars.

A chiral excess of isoleucine exists in GRA 95229, indicating that some mechanism must produce it. But still it is questionable if this relatively low level of chiral excess in isoleucine can explain the origin of homochirality. A 14% surplus of one enantiomer is a far cry from the 100% required for living systems.

http://www.academia.edu/6811752/The_Fly_in_the_Ointment_Homochirality_and_Extraterrestrial_Origin-Of-Life_Theories

Life chemistry demands homochirality (same chirality). Proteins cannot assemble unless all the chiralamino acids (20 out of the 21 bioactive amino acids are chiral) are either 100 percent left-handed or 100 percent right-handed. Likewise, DNA and RNA molecules cannot assemble unless all pentose sugars are 100 percent left-handed or right-handed. All organisms on Earth manifest only left-handed chiral amino acids and right-handed  pentose sugars.

http://www.reasons.org/articles/explanation-for-origin-of-lifes-molecular-handedness-is-insoluble

chiral excess in Earth’s oceans will not promote homochirality in life molecules, but, in fact, detracts from it.

http://www.reasons.org/articles/through-the-glass-darkly

a chiral excess of isoleucine exists in GRA 95229, indicating that some mechanism must produce it. But still it is questionable if this relatively low level of chiral excess in isoleucine can explain the origin of homochirality. A 14% surplus of one enantiomer is a far cry from the 100% required for living systems.

http://www.conservativenewsandviews.com/2012/10/22/creation/panspermia-really/

several pieces of evidence are deal-killers for one or both those theories. Among them: the richness of deuterium, which the Tagish Lake Meteorite and most comets have. Heavy hydrogen forms when water absorbs neutrons. That can happen only from an event that releases many neutrons. The tremendous earthquakes of the Global Flood likely produced that swarm of neutrons. An exploding planet between Mars and Jupiter could have produced such a swarm. But an interstellar meteor stream or dust or gas cloud could not. (The exploded planet theory has a deal-killer of its own, namely all the ice on the Moon and Mercury.)

So an interstellar origin defies logic and is well-nigh impossible. Without that, panspermia is equally impossible.

http://creationwiki.org/Panspermia

Objections to Panspermia

The full theory of panspermia requires two events to explain the presence of life on earth:

The generation of life outside the earth
The transfer of this life to earth

Many scientists have objected that the generation of life cannot occur, or have occurred, outside of a planetary environment, where heavier elements are plentiful. Almost the only elements present in interstellar space are hydrogen and helium--and the latter, being an inert or noble gas, is not a component of life in any form known to man.

The generation objection by itself would not destroy panspermia. But the transference event requires a transit through space, followed by a passage through the earth's atmosphere and then an impact on the ground or at sea. Either of these events is fraught with danger. The unprotected space outside of an atmosphere is subject to unfiltered radiation in various forms. These include the products of radioactive decay, cosmic rays (the highest-energy form of electromagnetic radiation known to man), and the stellar wind, a stream of particles that fly out from any star as it continuously burns. Even if any life forms could survive the spatial passage, it must then somehow penetrate the atmosphere and risk incineration from sheer friction, and then must survive the impact.

Recently a team of researchers at the Centre for Molecular Biophysics in France were able to simulate a meteoric entry by strapping rocks containing microfossils and laced with Chroococcidipsis, an unusually robust bacterium, to the heat shield of a rocket probe before it was launched and then ordered to re-enter the atmosphere. Though the microfossils remained after re-entry, the bacteria were all destroyed, and only their outlines remained. The investigators concluded that any bacteria or other micro-organisms in a meteorite would require at least 2 cm of rock covering to protect them. In fact, the experimental conditions seem to suggest that micro-organisms within an actual meteorite would require more shielding than 2 cm, because a typical meteorite enters the atmosphere at about twice the speed of the returning rocket probe.

1) http://www.reasons.org/articles/through-the-glass-darkly



Last edited by Admin on Fri Jan 06, 2017 8:12 am; edited 7 times in total

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http://www.academia.edu/6811752/The_Fly_in_the_Ointment_Homochirality_and_Extraterrestrial_Origin-Of-Life_Theories

Life chemistry demands homochirality (same chirality). Proteins cannot assemble unless all the chiralamino acids (20 out of the 21 bioactive amino acids are chiral) are either 100  percent left-handed or 100 percent right-handed. Likewise, DNA and RNA molecules cannot assemble unless all pentose sugars are 100 percent left-handed or right-handed. All organisms on Earth manifest only left-handed chiral amino acids and right-handed  pentose sugars.

http://www.reasons.org/articles/explanation-for-origin-of-lifes-molecular-handedness-is-insoluble

chiral excess in Earth’s oceans will not promote homochirality in life molecules, but, in fact, detracts from it.

View user profile http://elshamah.heavenforum.com

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