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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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Re: Theories - Origin of Life

... this as fact. The Nature article concludes with this acknowledgement by the authors. We speculate that both observations can be explained if late meteorite bombardment triggered the onset of the current style of mantle convection. Willbold, M., T. Elliott, et al. (2011). "The tungsten isotopic ...

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by scottie
Tue Oct 04, 2011 10:14 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 894062

The head of the dinosaur, which fell to Earth as a meteorite

It can be assumed that the head of the dinosaur has undergone mineralization is not on our planet, but before she fell to Earth as a meteorite. This is evidenced by its structure, typical of stony meteorites in the presence of black soot on its surface and granular structure, which filled ...

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by valentindolzhenko
Wed Apr 28, 2010 6:07 am
 
Forum: Evolution
Topic: The head of the dinosaur, which fell to Earth as a meteorite
Replies: 2
Views: 1795

Re:

... paradigm We don't even know if life actually began on the Earth. Some people have suggested that it may have been carried here e.g. along a meteorite or such. Maybe the early Earth wasn't suitable for the beginning of life after all, but instead some other place was?

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by biohazard
Tue Nov 10, 2009 9:59 am
 
Forum: Evolution
Topic: Is evolution determinate?
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Views: 8370

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: 12434
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