Editing STS-1 (section)

== External tank ==
STS-1 and [[STS-2]] were the only two shuttle flights to have the External Tank painted white. To reduce the Shuttle's overall weight, all flights from [[STS-3]] onward used an unpainted tank. The use of an unpainted tank provided a weight saving of approximately {{cvt|272|kg}},<ref name="et_paint">NASA [http://marshallstar.msfc.nasa.gov/8-19-99.pdf "NASA Takes Delivery of 100th Space Shuttle External Tank"] {{Webarchive|url=https://web.archive.org/web/20160307072913/http://marshallstar.msfc.nasa.gov/8-19-99.pdf|date=March 7, 2016}} Press release p. 99–193 16 August 1999 Retrieved July 17, 2013 {{PD-notice}}</ref> and gave the External Tank the distinctive orange color which later became associated with the Space Shuttle.