It would have to withstand frequent passages from direct sunlight into the darkness of Earth's shadow, which would cause major changes in temperature, while being stable enough to allow extremely accurate pointing of the telescope.. 
Nicomości contained a heat sink of solid nitrogen to Dutace the ther noise from the instrument, but shortly after it was Installed, an Tẹ́lẹ̀ ther expansion resulted in part of the heat sin  coming into contact with an publications baffle.. 