Editing Terraforming (section)

=== Moon ===
{{Main|Colonization of the Moon}}
[[File:TerraformedMoonFromEarth.jpg|thumb|right|210px|Artist's conception of the [[Moon]] terraformed as seen from Earth]]
Although the gravity on Earth's [[Moon]] is too low to hold an atmosphere for geological spans of time, if given one, it would retain it for spans of time that are long compared to human lifespans.<ref>{{cite web |last1=Oberg |first1=James |title=New Earths |url=http://www.jamesoberg.com/earth.html |website=jamesoberg.com}}</ref><ref name= "landis1990" /> Landis<ref name="landis1990">{{cite magazine |last=Landis |first=Geoffrey |date=June 1990 |title=Air Pollution on the Moon |url=https://www.geoffreylandis.com/moonair.html |magazine=Analog}}</ref> and others<ref name= "benford2014">{{cite web |last=Benford |first=Greg |date=July 14, 2014 |url=https://slate.com/technology/2014/07/terraforming-the-moon-it-would-be-a-lot-like-florida.html |title=How to Terraform the Moon |work=Slate |access-date=30 January 2017}}</ref><ref>{{cite news |last=Williams |first=Matt |date=March 31, 2016 |url=http://www.universetoday.com/121140/could-we-terraform-the-moon/ |title=How Do We Terraform the Moon? |work=Universe Today |access-date=30 January 2017}}</ref> have thus proposed that it could be feasible to terraform the Moon, although not all agree with that proposal.<ref>{{cite news |last=Dorminey |first=Bruce |url=https://www.forbes.com/sites/brucedorminey/2016/07/27/why-the-moon-should-never-be-terraformed |title=Why The Moon Should Never Be Terraformed |work=Forbes |date=July 27, 2016 |access-date=30 January 2017}}</ref> Landis estimates that a 6.89 kPa atmosphere of pure oxygen on the Moon would require on the order of two hundred trillion tons of oxygen, and suggests it could be produced by reducing the oxygen from an amount of lunar rock equivalent to a cube about fifty kilometers on an edge. Alternatively, he suggests that the water content of "fifty to a hundred comets" the size of [[Halley's Comet]] would do the job, "assuming that the water doesn't splash away when the comets hit the moon."<ref name= "landis1990" /> Likewise, Benford calculates that terraforming the moon would require "about 100 comets the size of Halley's."<ref name= "benford2014" />