One of the James Webb Space Telescope’s most iconic features is its segmented primary mirror: 18 hexagons made of beryllium (one of the strongest and lightest metals on Earth) covered in a thin layer of gold. Each segment is 4.5 feet in diameter (1.4 meters), and when the mirror is completely unfolded, it has a full diameter of 21.6 feet (6.5 meters). Webb needs a mirror this large to observe faint galaxies that are 13 billion light-years away. It will be able to collect more light than previous