Because graphite composites are hygroscopic, there was a risk that water vapor absorbed by the truss while in Lockheed's clean room would later be expressed in the vacuum of space; the telescope's instruments would be covered in ice.. 
Bàbá rẹ̀, Johann Ambrosius, Olúpé ilé -ẹjọ́ ni ó kọ́ láti mú violin.. 