Does the space shuttle get heated up while moving at high speed in space? If yes, we all know that moving surface gets heated up only when it collides with air particles but space is vacuum, then what is the obstruction that increases the temperature of the space shuttle?
Based on published values for hydrogen density in interstellar space one can estimate the heating on the leading surface of a ship moving at about 0.2 c to be several watts per square meter. (With radiators on other suraces, that might be collected and used to power devices within the ship.) (The drag forces wold still be quite small.)