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IRL KSP: Orion Spacecraft


Spyritdragon

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http://en.wikipedia.org/wiki/Space_Shuttle_external_tank

The original ET is informally known as the Standard Weight Tank (SWT) and is fabricated from 2219, a high-strength aluminum–copper alloy used for many aerospace applications. The first two, used for STS-1 and STS-2, were painted white to protect the tanks from ultraviolet light during the extended time that the shuttle spends on the launch pad prior to launch.[6] Because this did not turn out to be a problem, Lockheed Martin (at that time, Martin Marietta) reduced weight by ceasing to paint the external tanks beginning with STS-3, leaving the rust-colored spray-on insulation bare, saving approximately 272 kg (600 lb).[7]

It is just the way it is. :)

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