In today's world, apart from economic competition and military competition, many countries attach great importance to the space industry. In the early days of the hegemony between the United States and the Soviet Union, the United States and the Soviet Union held various competitions in launching satellites and made some comparisons. It is groundbreaking to see that the Soviet Union achieved the great feat of manned space flight, realized the first human desire not to be surpassed in space, quickly sent astronauts to the moon, and realized the amazing miracle of manned landing on the moon for the first time.

I don't know if you have noticed that the surfaces of spacecraft developed by many countries are almost covered with gold foil or silver foil. These things are actually multilayer insulation materials, also called multilayer insulation blankets. It is an important "protective layer" of spacecraft. Spacecraft is wrapped in multi-layer heat insulation blanket, which is mainly used for some ultra-high temperature or low temperature equipment exposed in space or on the moon. Its main purpose is to protect the interior and exterior of space equipment from ultraviolet radiation or some mechanical stress.

Multilayer insulation blanket is generally composed of polyimide film, usually consisting of one or two aluminum films. This low conductivity material can separate aluminum layers, thus forming all layers of multi-layer isolation layers to protect the system. The purpose of using multiple radiation heat exchange barriers is to limit the flow of energy, so that internal components will not lose too much heat or the outside will be damaged by too much heat. Just like the International Space Station and satellites, they all have their own unique design system, which can help them keep the best working temperature at any time, not too hot or too cold.

Multi-layer thermal insulation is a silver-plated or gold-plated layer covering some space equipment or satellites, which can help spacecraft maintain the best temperature system in space. In addition to the application in spacecraft and other equipment, such as some propellant pipes, propulsion cabins, solid rocket engines, etc., it should also be protected and multi-layer insulation blankets should be used to maintain the best temperature and "working environment" during work and operation.

Generally speaking, the multilayer insulation blanket we often see in some spacecraft pictures is gold. For some space equipment, such as China's Chang 'e-3 lander, the multilayer insulation blanket is made of gold. There are other colors, such as silver and black. We see fewer blacks than blacks. Silver is also common. The International Space Station in the United States and Russia uses silver. What we usually see is that we usually use more gold multilayer insulating blankets, while the United States uses more silver. In fact, both gold and silver are used by major aerospace countries.