, The JWST will be located near the second Lagrange point (L2) of the Earth-Sun system, which is 1,500,000 kilometres (930,000 mi) from Earth, directly opposite to the Sun.  Eighteen primary mirror segments, secondary, tertiary and fine steering mirrors, plus flight spares have been fabricated and polished by Ball Aerospace & Technologies based on beryllium segment blanks manufactured by several companies including Axsys, Brush Wellman, and Tinsley Laboratories.  These technologies were deemed sufficiently mature to retire significant risks in the project. Existing space telescopes such as Hubble cannot study these bands since their mirrors are insufficiently cool (the Hubble mirror is maintained at about 15 °C (288 K)) thus the telescope itself radiates strongly in the infrared bands. The long-awaited James Webb Space Telescope (JWST) is due to launch in March 2021, beginning a new era of space observation. The James Webb Space Telescope (sometimes called Webb or JWST) is a large infrared telescope with a 6.5-meter primary mirror. The James Webb Space Telescope (JWST or "Webb") is a space telescope that is planned to succeed the Hubble Space Telescope as NASA's flagship astrophysics mission. Because the universe is expanding, as the light travels it becomes red-shifted, and objects at extreme distances are therefore easier to see if viewed in the infrared.  Current cost of development is over $10 billion. James Webb’s primary mirror has a diameter of 6.5 meters while Hubble Space’s primary mirror is 2.4 meters in diameter. , The JWST is oriented toward near-infrared astronomy, but can also see orange and red visible light, as well as the mid-infrared region, depending on the instrument. , The JWST will operate near the Earth–Sun L2 (Lagrange point), approximately 1,500,000 kilometres (930,000 mi) beyond Earth's orbit. The Space Telescope Science Institute (STScI), located in Baltimore, Maryland, on the Homewood Campus of Johns Hopkins University, was selected as the Science and Operations Center (S&OC) for JWST with an initial budget of US$162.2 million intended to support operations through the first year after launch. The primary cause of the delay: to ensure that NASA is as confident as possible before launch.Since there will be no way of repairing the JWST if something goes wrong out in space, they want to ensure everything is in the best shape it can be before sending it adrift.“Simply put, we have one shot to get this right before going into space,” Thomas Zurbuchen, Associate Administrator of NASA’s Science Mission Directorate (SMD), said during today’s press conference. Webb’s 5-layer sunshield has been successfully deployed and tensioned into the same configuration it will have once in space! Image Credit: NASA/Chris Gunn. Lengthened to the size of a tennis court, the five-layer sunshield of NASA’s fully assembled James Webb Space Telescope successfully completed a final series of large-scale deployment and tensioning tests. Cooler tested for NASA telescope", "JPL: Herschel Space Observatory: Related Missions", "Hubble Space Telescope – Wide Field Camera 3", "US astronomy: Is the next big thing too big? This milestone puts the observatory one step closer to its launch in 2021. The remaining technology development item (the MIRI cryocooler) completed its technology maturation milestone in April 2007. The primary mirror of the JWST, the Optical Telescope Element, is composed of eighteen hexagonal mirror segments of 1.32 metres (4 ft 4 in) incircle diameter made of gold-plated beryllium which combine to create a 6.5 metres (21 ft) diameter mirror—considerably larger than Hubble's 2.4 metres (7 ft 10 in) mirror.  In 1997, NASA worked with the Goddard Space Flight Center, Ball Aerospace & Technologies, and TRW to conduct technical requirement and cost studies, and in 1999 selected Lockheed Martin and TRW for preliminary concept studies. Since water vapor and carbon dioxide in the Earth's atmosphere strongly absorbs most infrared, ground-based infrared astronomy is limited to narrow wavelength ranges where the atmosphere absorbs less strongly. Often referred to as the replacement for the Hubble Space Telescope, its existence has been in jeopardy since a … The telescope will circle about the L2 point in a halo orbit, which will be inclined with respect to the ecliptic, have a radius of approximately 800,000 kilometres (500,000 mi), and take about half a year to complete. Based on recommendations by an Independent Review Board, the new launch date for Webb is 30 March 2021.  It has been possible to maintain a temperature low enough through the design of the spacecraft to enable near-infrared observations without a supply of coolant, such as the extended missions of Spitzer Space Telescope and Wide-field Infrared Survey Explorer. The Webb Telescope is roughly 65 feet (21 meters) from end to end and about 3 stories high. "NASA JWST FAQ "Who are the partners in the Webb project? The telescope comes equipped with a mirror that can extend 21 feet and 4 inches -- a massive length that will allow the mirror to collect more light …  This has meant most infrared telescopes have a lifespan limited by their coolant, as short as a few months, maybe a few years at most.  The planned five year science mission begins after a 6-month commissioning phase. 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