Changes

Ten years later, the Giant Impact Hypothesis emerged as the leading model after a conference about Moon origin in Kona, Hawaii. In the 1990s, Robin Canup picked up the research and created simulations to determine possible scenarios that might explain the formation of the Moon.<ref name="PSI"/><ref name="Nova2"/>

Ten years later, the Giant Impact Hypothesis emerged as the leading model after a conference about Moon origin in Kona, Hawaii. In the 1990s, Robin Canup picked up the research and created simulations to determine possible scenarios that might explain the formation of the Moon.<ref name="PSI"/><ref name="Nova2"/>

Canup initially came to the conclusion that much of the material blasted off by a "Big Whack" would either fall back to Earth or fly off into space, thus requiring a very large impactor, one two or three times larger than initially envisaged. However, later on, improved computer simulations suggested that the size of the impactor might not have to be so large after all, thus leaving all calculations regarding mass and momentum intact.<ref name="PSI"/><ref name="SciAm">Scientific American: [http://www.sciam.com/article.cfm?chanID=sa006&colID=5&articleID=000A90B0-C919-1C6E-84A9809EC588EF21 "Earth-Shattering Theory"]</ref>

Canup initially came to the conclusion that much of the material blasted off by a "Big Whack" would either fall back to Earth or fly off into space, thus requiring a very large impactor, two or three times larger than initially envisaged. However, later on, improved computer simulations suggested that the size of the impactor might not have to be so large after all, thus leaving all calculations regarding mass and momentum intact.<ref name="PSI"/><ref name="SciAm">Scientific American: [http://www.sciam.com/article.cfm?chanID=sa006&colID=5&articleID=000A90B0-C919-1C6E-84A9809EC588EF21 "Earth-Shattering Theory"]</ref>

===Criticism===

===Criticism===