There is a difference between the temperature that a large solid body such as a spacecraft will get to in space and the temperature of the gas/plasma that it is flying through.
Originally posted by Andres Hung
@Sep 30 2004, 10:40 PM
How cold is space?
A spacecraft without a heat source between stars should get down pretty close to 3 Kelvins because it can radiate heat pretty efficiently even though the gas it is flying through may have a temperature between five and ten thousand Kelvins.
Forming opinions as we speak