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The world's oldest meteorite crater —a giant impact zone more than 62 miles wide — has been found in Greenland, scientists say.
Originally posted by DaveNorris
maybe the dinosaurs originally developed on earth by themselves and then the meteor was sent to wipe them out and create us........
Panspermia (Greek: πανσπερμία from πᾶς/πᾶν (pas/pan) "all" and σπέρμα (sperma) "seed") is the hypothesis that life exists throughout the Universe, distributed by meteoroids, asteroids and planetoids.
Panspermia proposes that life that can survive the effects of space, such as extremophile archaea, become trapped in debris that is ejected into space after collisions between planets that harbor life and Small Solar System Bodies (SSSB). Bacteria may travel dormant for an extended amount of time before colliding randomly with other planets or intermingling with protoplanetary disks. If met with ideal conditions on a new planet's surfaces, the bacteria become active and the process of evolution begins. Panspermia is not meant to address how life began, just the method that may cause its sustenance.
The related but distinct idea of exogenesis (Greek: ἔξω (exo, "outside") and γένεσις (genesis, "origin")) is a more limited hypothesis that proposes life on Earth was transferred from elsewhere in the Universe but makes no prediction about how widespread it is. Because the term "exogenesis" is more well-known, it tends to be used in reference to what should strictly speaking be called panspermia.
A group of scientists led by David McKay of NASA's Johnson Space Center published an article in the 16 August 1996 issue of Science magazine announcing the discovery of evidence for primitive bacterial life on Mars. An examination of a meteorite found in Antarctica and believed to be from Mars shows: 1) hydrocarbons which are the same as breakdown products of dead micro-organisms on Earth, 2) mineral phases consistent with by-products of bacterial activity, and 3) tiny carbonate globules which may be microfossils of the primitive bacteria, all within a few hundred-thousandths of an inch of each other. Based on age dating of the meteorite, the following scenario has been proposed:
The original igneous rock solidified within Mars about 4.5 billion years ago, about 100 million years after the formation of the planet. (Based on isotope ages of the igneous component of the meteorite)
Between 3.6 and 4 billion years ago the rock was fractured, presumably by meteorite impacts. Water then permeated the cracks, depositing carbonate minerals and allowing primitive bacteria to live in the fractures.
About 3.6 billion years ago, the bacteria and their by-products became fossilized in the fractures. (Based on isotope ages of the minerals in the fractures)
16 million years ago, a large meteorite struck Mars, dislodging a large chunk of this rock and ejecting it into space. (Based on the cosmic ray exposure age of the meteorite)
13,000 years ago, the meteorite landed in Antarctica.
The meteorite, ALH84001, was discovered in 1984 in the Allan Hills region of Antarctica.
How do we know the meteorite came from Mars?
Meteorite ALH84001 is a softball-sized igneous rock weighing 1.9 kilograms (4.2 pounds). It is one of twelve meteorites discovered on Earth which are thought to be from Mars. Most meteorites formed early in the history of the solar system, some 4.6 billion years ago. Eleven of the twelve martian meteorites have ages less than 1.3 billion years, ALH84001 at 4.5 billion years old being the only exception. All twelve are igneous rocks crystallized from molten magma in a way which suggests they formed in a planetary-sized body, not an asteroid. They have similar oxygen isotope characteristics to each other and higher concentrations of ferric iron, water, and other volatiles than other meteorites. All twelve also show evidence of shock heating, presumably as a result of the impact which ejected them into space. Gas bubbles trapped in one meteorite, EETA79001, have a composition which matches the current martian atmosphere as measured by the Viking Landers, compelling evidence that this meteorite and by association the others, including ALH84001, came from Mars.
Originally posted by Infi8nity
Maybe some species of dinosaurs wear advanced and survived. Maybe this is where we get the reptilian conspiracy from.
Originally posted by Jason88
They haven't tested them all. But, I do believe the keys to the kingdom lay in some meteors. I'll check out ALH84001. Thanks.
Originally posted by phantomjack
reply to post by Jason88
Why would any advanced being resort to a primitive method of delivery like a Meteor?
Don't you think they would be advanced enough to do it mechanically instead of having to FIND a meteor on collision corse with Earth?
I would think they would come up with something a little more direct, like, a device that didn't depend on a particular trajectory, but instead guided?
Simple life may equally well have travelled from Earth to planets outside the Solar System, the scientists believe. The process, known as lithopanspermia, could mean the universe is teeming with Earth-like life.
'Our work ... says that lithopanspermia might have been very likely, and it may be the first paper to demonstrate that,' said lead researcher Dr Edward Belbruno, from Princeton University in the US. 'If this mechanism is true, it has implications for life in the universe as a whole. 'This could have happened anywhere.' Large volcanic eruptions, meteorite impacts and collisions with other bodies can cause rocky fragments of planets to fly into space.