Invisible cosmophile

By Azka Amjad JAMES WEBB SPACE TELESCOPE Abbreviations used in article : JWST: James webb space telescope IR: infrared ISIM : Integrated science instrument module.  HISTORY : The construction of JWST was started in 1996 by collaboration of NASA, ESA(European Space agency),CSA (Canadian space agency). And it was planned to launch in 2007 and its budget was fixed to be 500 million dollars. But in 2005 many changes were made in its initial design and its launch date was delayed. Its construction was completed in 2016at the expense of about 10 billion dollars. Then some initial tests were conducted, which continued till 2019and it was planned to launch it in March 2021.But due to some technical issue its launch was again delayed till December 2021 and finally it was launched on 25 december at 12:20 UTC by an Ariane 5 rocket from European Space Agency's launch site in Kourou, French Guiana.  MAIN PARTS OF JWST : •PRIMARY MIRROR It consists of 18 hexagonal segments made of beryllium me