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 Good Happy aliens...

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Majmun


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PostajNaslov: Re: Good Happy aliens...   sri lip 24, 2009 12:22 pm

Black Angel je napisao/la:
To sa mjesecom i zivotom na njemu nije uopce toliko suludo.
Pretpostavljam da vecina vas zna da je mjesec nastao kad je asteroid udario u zemlju i rascijepao komad nje koji je odletio u orbitu.
Tako je nastao mjesec.

Evo ja sad znam :D

Ali u kakvom je to zemlja bila stanju kad ju je rascjepio, užarena kugla? Asteroid je onako pljasnuo u nju i kapljice su letile okolo.

Hmmm, onda je tu krenuo isti postupak ko i na zemlji, brže se ohladio jer je bio manji i počeo je život :D

Kad se zemlja ohladila svi su se preselili, ali zašto je mjesec sad takakav kakav je, groblje?
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zvezda
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PostajNaslov: Re: Good Happy aliens...   sri lip 24, 2009 1:02 pm

Formation
Artist's conception of the giant impact hypothesis

Several mechanisms have been suggested for the Moon's formation. The formation of the Moon is believed to have occurred 4.527 ± 0.010 billion years ago, about 30–50 million years after the origin of the Solar System.

Fission hypothesis
Early speculation proposed that the Moon broke off from the Earth's crust because of centrifugal forces, leaving a basin – presumed to be the Pacific Ocean – behind as a scar. This idea, however, would require too great an initial spin of the Earth; and, even had this been possible, the process should have resulted in the Moon's orbit following Earth's equatorial plane. This is not the case.

Capture hypothesis
Other speculation has centered on the Moon being formed elsewhere and subsequently being captured by Earth's gravity. However, the conditions believed necessary for such a mechanism to work, such as an extended atmosphere of the Earth in order to dissipate the energy of the passing Moon, are improbable.

Co-formation hypothesis
The co-formation hypothesis proposes that the Earth and the Moon formed together at the same time and place from the primordial accretion disk. The Moon would have formed from material surrounding the proto-Earth, similar to the formation of the planets around the Sun. Some suggest that this hypothesis fails to adequately explain the depletion of metallic iron in the Moon.

A major deficiency in all these hypotheses is that they cannot readily account for the high angular momentum of the Earth–Moon system.

Giant Impact hypothesis

Main article: Giant impact hypothesis

The prevailing hypothesis today is that the Earth–Moon system formed as a result of a giant impact. A Mars-sized body (labelled "Theia") is believed to have hit the proto-Earth, blasting sufficient material into orbit around the proto-Earth to form the Moon through accretion. As accretion is the process by which all planetary bodies are believed to have formed, giant impacts are thought to have affected most if not all planets. Computer simulations modelling a giant impact are consistent with measurements of the angular momentum of the Earth–Moon system, as well as the small size of the lunar core. Unresolved questions regarding this theory concern the determination of the relative sizes of the proto-Earth and Theia and of how much material from these two bodies formed the Moon.

Preuzeto iz: Wikipedia

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Black Angel
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PostajNaslov: Re: Good Happy aliens...   sri lip 24, 2009 2:01 pm

zvezda je napisao/la:
Ta teorija da je Mesec nastao od dela Zemlje, izneta iznad... ???

Zar Mesec nije wanderer koji je dolutao pa ga Zemljina gravitacija privukla??? *

To je skoro pa nemoguce......
Nije on sad puzao 1m/s da ga je zemlja samo tako privukla.....
Ako jest ta teorija tocna onda bi mjesec morao imati mnogo duzu putanju jer je proletio kraj zemlje pri dosta velikoj brzini......
Ako ga je nekako i uspjela zemlja uhvatit ta mjeseceva putanja bi bila nama pogubna zbog mjeseceve gravitacije (prolazio bi preblizu zemlje)
Nekako mi se vjerojatnije cini da se odlomio od zemlje, a kako je tada zemlja bila jedna velika hrpa lave, lako je poprimila svoj danasnji oblik.
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PostajNaslov: Re: Good Happy aliens...   Today at 5:16 pm

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