How are the paint colors determined for rockets?

火箭上喷涂的颜色是怎么决定的？

原文地址：https://www.quora.com/How-are-the-paint-colors-determined-for-rockets

Robert Frost：

White is usually selected because it keeps the pre-launch rocket cooler than a dark color would. Cryogenic fuels boil off, while the rocket is on the pad. Anything that can keep the rocket cooler and not add mass is a cost savings.
通常火箭选择白色是因为相对于黑色白颜色能让准备发射的火箭保持在一个更低的温度。在发射台上的时候，火箭的低温燃料会挥发，能让火箭温度低下来同时又不增加额外的重量就是在节约金钱。

Some rockets, for example the Saturn V, have black patterns. These are called roll patterns. They are there so that observers on the ground can detect roll axis rates on the vehicle.
有些火箭，比如土星 5 号，有黑色的部分。这些被称为滚动图案，那些部分存在的意义是为了让地面的观测者方便测量火箭的旋转速率。

Some rockets have orange sections. Those sections are not painted. That is the natural color of a foam insulation that is used for those cryogenic sections.
有些火箭有黄色的部分。那些部分是没有被喷涂颜色。那就是用于火箭上低温部位的泡沫隔离材料的本来颜色。