Changes

:*A high-velocity collision might be sufficient to release enough energy to place a substantial mass of the [[Earth]]'s crust into orbit.

:*A high-velocity collision might be sufficient to release enough energy to place a substantial mass of the [[Earth]]'s crust into orbit.

== Criticism of the Giant-Impact Model ==

== Criticisms of the Giant-Impact Model ==

This new theory lacks testability and falsifiability, which are essential aspects of science as explained by [[Karl Popper]].   

This new theory lacks testability and falsifiability, which are essential aspects of science as explained by [[Karl Popper]].   

Scientists did find that none of three proposed tests are "supportive of the Giant Impact model."<ref>http://www.lpi.usra.edu/meetings/origin98/pdf/4045.pdf</ref>

Scientists did find that none of three proposed tests are "supportive of the Giant Impact model."<ref>http://www.lpi.usra.edu/meetings/origin98/pdf/4045.pdf</ref>

Another article noted that the Moon is lacking in siderophilic elements (Au, Co, Fe, Ir, Mn, Mo, Ni, Os, Pd, Pt, Re, Rh, Ru) found on Earth, and this indicates that the Moon was not formed by materials broken off of Earth, thereby falsifying the theory.<ref>http://www.ias.ac.in/jessci/dec2005/ilc-3.pdf</ref>

Another article noted that the Moon is lacking in siderophilic elements (Au, Co, Fe, Ir, Mn, Mo, Ni, Os, Pd, Pt, Re, Rh, Ru) found on Earth, and this indicates that the Moon was not formed by materials broken off of Earth, thereby demonstrating the implausibility of the theory.<ref>http://www.ias.ac.in/jessci/dec2005/ilc-3.pdf</ref>

A third study found that "the bulk composition of the Moon differs significantly from that of the terrestrial mantle" and that "[t]he high

A third study found that "the bulk composition of the Moon differs significantly from that of the terrestrial mantle" and that "[t]he high

:Considering all the twists and turns in lunar science, nobody claims that the models are complete just yet.

:Considering all the twists and turns in lunar science, nobody claims that the models are complete just yet.

== Reference ==

== Reference ==