Why are space shuttles covered with golden-colored sheets? What material is used?
宇宙飛船上那層金色的物質(zhì)是什么？
Space Shuttles were not covered with golden-colored sheets. I must assume you are using the term space shuttle when, what you mean to refer to, are spacecraft like the Apollo Lunar Module or the HTV cargo vehicle.
宇宙飛船外面那層并不是金色的薄片。我必須假設(shè)你所說的宇宙飛船是指類似于阿波羅登陸倉或者是 ＨＴＶ貨倉那種。
The gold blankets are thermal blankets. A thermal blanket can have up to 25 layers. The outer, and thus visible, layer is kapton tape with a very thin layer of gold leaf or some other non-reactive metal applied to it. The various layers are composed of material such as kapton, mylar, aluminum, nickel foil, glass wool, titanium, and gold.
金色的鋪蓋層是隔熱層。隔熱層的厚度最多可以達(dá)到２５層。外面可以看到的那層是涂抹了金或者是其他不活潑金屬的聚酰亞胺膠帶。隔熱層的不同部分由聚酰亞胺、聚對(duì)苯二甲酸乙二酯、鋁、鎳箔、玻璃棉、鈦以及金等組成。
Such blankets can both reflect external heat (from the Sun) and trap internal heat inside the object to prevent freezing.
這樣的隔熱層在反射熱量（來自太陽）的同時(shí)可以保持內(nèi)部的熱量不降低。
