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Meteorite

meteorite

(Science: chemical) A mass of stone or iron which has fallen to the earth from space; an aerolite.

Meteorites usually show a pitted surface with a fused crust, caused by the heat developed in their rapid passage through the earth's atmosphere. A meteorite may consist: 1. Of metallic iron, alloyed with a small percentage of nickel (meteoric iron, holosiderite). When etched this usually exhibits peculiar crystalline figures, called widmanstatten figures. 2. Of a cellular mass of iron with imbedded silicates (mesosiderite or siderolite). 3. Of a stony mass of silicates with little iron (meteoric stone, sporadosiderite). 4. Of a mass without iron (asiderite).

Origin: Cf. F. Meteorite.


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Alternative Theories to Evolution

Yeah, i struggle with exogenesis, what other entries are there into our planet other than a meteorite? And to survive in space it would need to be a chemotroph or something, but even then it doesn't have most material available that our current organisms use - water,co2,o2 ...

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by futurezoologist
Mon Jun 15, 2009 10:50 pm
 
Forum: Evolution
Topic: Alternative Theories to Evolution
Replies: 13
Views: 402

Panspermia

... and the above posts pretty much sum it up but if you mean where it started youve got: panspermia hypothesis: life came from another planet on meteorite etc. Bible: you know or the mainstream - it originated on earth because the early earths atmoshere had no oxygen=no oxydisation=organic compunds ...

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by futurezoologist
Wed Mar 11, 2009 9:39 am
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 9
Views: 3107

Re: PLEASE HELP! arguments in evolution

Right. Good point about the meteorite. I was thinking of evolution on earth. I don't think there's enough time for that. So, if on some other planet they had time to evolve bacteria and the bacteria made it to earth, that would jump start ...

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by stevor
Thu May 01, 2008 6:26 pm
 
Forum: Evolution
Topic: PLEASE HELP! arguments in evolution
Replies: 52
Views: 5483

FACT

... of other theories, some verging onto psuedoscience. Some people believe that aliens created life on Earth, others believe that life came from a meteorite from space. Hinduism states that life was born out of a "cosmic egg". These theories are all technically possible and it's likely ...

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by Condraz23
Fri Oct 13, 2006 7:14 pm
 
Forum: Evolution
Topic: FACT
Replies: 22
Views: 3223

The Fiber Disease

... gas flows. (Precedents: divarication of the comet of Biela; deviations of such comets from their initial orbits.) 6. Soft landing of the Tunguska meteorite upon the swamps. Splitting up into fractions of gas-hydrate ice. Quick sublimation process. Formation of a column of an explosive mixture. ...

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by Nadas Moksha
Fri Aug 25, 2006 3:09 am
 
Forum: Human Biology
Topic: The Fiber Disease
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Views: 749215
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