Editing Atmospheric entry (section)

=====PICA-X=====
An improved and easier to produce version called PICA-X was developed by [[SpaceX]] in 2006–2010<ref name="N+SX_picaX"/> for the [[SpaceX Dragon 1|Dragon]] [[space capsule]].<ref name=srdc20090223>{{cite web|url=http://www.spaceref.com/news/viewpr.html?pid=27612|title=SpaceX Manufactured Heat Shield Material Passes High Temperature Tests Simulating Reentry Heating Conditions of Dragon Spacecraft|website=www.spaceref.com|date=February 23, 2009 }}</ref> The first reentry test of a PICA-X heat shield was on the [[Dragon C1]] mission on 8 December 2010.<ref name=clog20101208>[https://web.archive.org/web/20101211200945/http://cosmiclog.msnbc.msn.com/_news/2010/12/08/5614525-dragon-could-visit-space-station-next Dragon could visit space station next], ''[[msnbc.com]]'', 2010-12-08, accessed 2010-12-09.</ref> The PICA-X heat shield was designed, developed and fully qualified by a small team of a dozen engineers and technicians in less than four years.<ref name="N+SX_picaX">
{{cite web
 |last=Chambers 
 |first=Andrew 
 |title=NASA + SpaceX Work Together 
 |url=http://www.nasa.gov/offices/oce/appel/ask/issues/40/40s_space-x_prt.htm
 |publisher=NASA 
 |access-date=2011-02-16 
 |author2=Dan Rasky 
 |date=2010-11-14 
 |quote=''SpaceX undertook the design and manufacture of the reentry heat shield; it brought speed and efficiency that allowed the heat shield to be designed, developed, and qualified in less than four years.''' 
 |url-status=dead 
 |archive-url=https://web.archive.org/web/20110416170908/http://www.nasa.gov/offices/oce/appel/ask/issues/40/40s_space-x_prt.htm 
 |archive-date=2011-04-16 
}}</ref>
PICA-X is ten times less expensive to manufacture than the NASA PICA heat shield material.<ref name="a&s201201">{{cite news
| last=Chaikin
| first=Andrew
| title=1 visionary + 3 launchers + 1,500 employees = ? : Is SpaceX changing the rocket equation?
| url=http://www.airspacemag.com/space/is-spacex-changing-the-rocket-equation-132285884/?page=2
| access-date=2016-06-03
| newspaper=Air & Space Smithsonian
| date=January 2012
| quote=''SpaceX's material, called PICA-X, is one-tenth as expensive than the original [NASA PICA material and is better], ... a single PICA-X heat shield could withstand hundreds of returns from low Earth orbit; it can also handle the much higher energy reentries from the Moon or Mars.''
| archive-date=September 7, 2018
| archive-url=https://web.archive.org/web/20180907221220/https://www.airspacemag.com/space/is-spacex-changing-the-rocket-equation-132285884/?page=2
| url-status=live
}}</ref>