Use incognito to see it. The problem is that the glass needs to be cooled very quickly or it forms crystals, but drawing must be done slowly since molten glass

Use incognito to see it. The problem is that the glass needs to be cooled very quickly or it forms crystals, but drawing must be done slowly since molten glass can only flow so fast. Microgravity has been shown to greatly improve the quality of the glass. The theory goes that convection (where hotter liquid rises past cooler liquid due to its lower density) causes small circular movements of glass that are really good at nucleating crystals. > Those are definitely expensive, but I think space flight is quite "up there" in cost too. The machinery is the expensive part. A million dollars of fiber, if it's 1 km, only weighs ~1 kg. On a Falcon 9 that's <$2000. Shipping and handling is usually a hell of a lot more than .2% of a product's cost!