Is the gold you see on spaceships gold?

When we gaze at images of spacecraft gleaming with golden hues, it's natural to wonder: is that shimmering material truly gold? The answer is both yes and no. While some components of spacecraft do utilize real gold for its exceptional properties, the golden appearance often observed is primarily due to a material known as multi-layer insulation (MLI).

MLI is a thermal insulation composed of multiple layers of thin, reflective films, typically made from materials like aluminized Mylar or Kapton. These layers are designed to reflect thermal radiation, effectively regulating the spacecraft's temperature in the extreme conditions of space. The outermost layer of MLI often has a gold-like appearance, not because it's made of gold, but due to the specific materials and coatings used to achieve optimal thermal control.

However, gold itself plays a crucial role in space technology. Its excellent reflectivity, superior conductivity, and resistance to tarnishing make it invaluable. For instance, the James Webb Space Telescope's mirrors are coated with a thin layer of gold to enhance their ability to reflect infrared light. Additionally, gold is used in the visors of astronauts' helmets to protect their eyes from harmful solar radiation.

In summary, while the gold-like sheen on spacecraft is usually due to MLI designed for thermal insulation, real gold is strategically employed in specific components where its unique properties are essential for the success of space missions.