The satellites and lunar surface detectors we launch into space are all manufactured at great cost and are very precise detectors. These detectors want to work normally in the harsh environment of space. , it is necessary to ensure that it is not affected by the space environment. On the surface of the earth, due to the existence of the atmosphere, any object on the surface is "immersed" in the air. The air itself serves as a heat transfer medium, which can heat the objects inside it evenly. However, this condition does not exist in space. Due to the lack of As a heat transfer medium, the first thing satellites in space have to face is temperature control.

What is "gold foil" made of? Judging from the molecular structure, it is mainly composed of polyimide or polyester, and its outer layer also has a very thin aluminum film. The reason for choosing polyimide is its unique physical and chemical properties, which can withstand high and low temperatures. It is an indispensable substance in protecting spacecraft. Gold foil is a polymer material. It can not only withstand the high temperatures brought by the universe and aircraft, but can also maintain no deformation, fracture, or shattering in low temperature environments of more than minus 260 degrees.

The temperature in space is generally -270 degrees Celsius. Because satellites are affected by direct sunlight, the temperature can reach about 100 degrees Celsius. Moreover, since there is no heat transfer medium in space, the heat dissipation of satellites is also a difficulty. Only It can dissipate heat through thermal radiation. The high temperature experienced by the satellite is enough to affect the operation safety of the electronic components inside the satellite. Gold foil also has good heat dissipation properties. Gold foil is also known as the "space blanket". It is used to help astronauts keep warm and insulate. It is also fireproof, greatly improving the survival rate of astronauts.

Gold foil is a composite of polyimide and aluminum foil. Polyimide itself is a light yellow substance, which is why this film is so golden. It is an organic polymer material with high comprehensive properties. It can withstand high temperatures of more than 400 degrees and can withstand very high low temperatures. It also has excellent mechanical properties, radiation resistance and dielectric properties, so this material has become the choice of spacecraft insulation layer.