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Silicon is present in many stars and planetary crusts and is a principal component of a class of meteorites known as aerolites. It is also usually found just below the surface of some asteroids and mined in huge Silicon mines in space.

Used in transistors, solar cells, rectifiers, and other solid-state devices which are used extensively in the electronics and space industries. In the form of sand and clay it is used by primitive civilizations to make concrete and brick, and it also is a useful refractory material for high-temperature work.