It is so large it is made in 18 pieces that fold together during the launch, so that it can fit into a rocket.

The review concluded the project was technically sound, but that funding phasing at NASA needed to be changed. Le JWST se présente comme le successeur de Hubble, lancé en 1990 et ayant révolutionné l'astronomie. Courriel, [2] There is a grid pattern bonded to each layer at intervals. "Next generation space telescope" and "JWST" redirect here. However, the telescope itself is not serviceable, and astronauts would not be able to perform tasks such as swapping instruments, as with the Hubble Telescope. [27] Its halo orbit around L2 point avoids the shadow of the Earth and Moon, maintaining a constant environment for the sunshield and solar arrays. The James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) and Command and Data Handling (ICDH) engineering team uses SpaceWire to send data between the science instruments and the data-handling equipment. [9] Its halo orbit around L2 avoids the shadow of the Earth and Moon, maintaining a constant environment for the sunshield and solar arrays. [43][135], Some of the missions in infrared astronomy that impacted JWST development were Spitzer and also the Wilkinson Microwave Anisotropy Probe (WMAP) probe. This arrangement will keep the temperature of the spacecraft below 50 K (−223.2 °C; −369.7 °F), necessary for infrared observations. Subsequent to this initial configuration they will only need occasional updates every few days to retain optimal focus. De missie vaan de JWST besteit oet de volgende doele: ", "NASA James Webb Space Telescope model lands at South by Southwest", "NASA's Next Telescope Could ID Alien Megastructures", "Frequently asked questions: How long will the Webb mission last? In summer 2010, the mission passed its Critical Design Review (CDR) with excellent grades on all technical matters, but schedule and cost slips at that time prompted Maryland US Senator Barbara Mikulski to call for an independent review of the project. "NASA Announces New James Webb Space Telescope Target Launch Date", "How does the Webb Contrast with Hubble? NASA Invites Artists to Visit James Webb Space Telescope (30172345630).jpg 640 × 640 ; 205 Kio. Objects near this point can orbit the Sun in synchrony with the Earth, allowing the telescope to remain at a roughly constant distance[25] and use a single sunshield to block heat and light from the Sun and Earth. It will have a main mirror that is 6.5 metres (21 feet) wide. It will be able to see things that the Hubble Space Telescope cannot. [49], The Spacecraft Bus is connected to Optical Telescope Element via the Deployable Tower Assembly, which also connects to the sunshield. [114][115], In February 2019, despite expressing criticism over cost growth, Congress increased the mission's cost cap by US$800 million. The design called for a descoped 6.1 metres (20 ft) primary mirror and a launch date of 2010. [92] By the mid-2010s, the U.S. contribution was still expected to cost US$8.8 billion.

"NASA JWST FAQ "Who are the partners in the Webb project? Une nouvelle de Wikinews, la source d'informations que vous pouvez écrire. James Webb Space Telescope (JWST) is a telescope that will be put into space. JWST observing time is expected to be highly oversubscribed. In 2003, NASA awarded the US$824.8 million prime contract for the NGST, now renamed the James Webb Space Telescope, to TRW. The JWST will be in orbit far from Earth, to avoid heat radiating from the Earth and moon. [3] However, in the long term even stored on Earth, Kapton used on the Skylab Apollo Telescope Mount had degraded after 40 years.

[61] Other early plans called for a NEXUS precursor telescope mission.[62][63].

[132] Observing in the infrared is a key technique for achieving this because of cosmological redshift and because it better penetrates obscuring dust and gas. In November 2017, the Space Telescope Science Institute announced the selection of 13 Director's Discretionary Early Release Science (DD-ERS) programs, chosen through a competitive proposal process. [109], A review of NASA budget records and status reports noted that the JWST is plagued by many of the same problems that have affected other major NASA projects. [58] When Hubble formally started in 1972, it had an estimated development cost of US$300 million (or about US$1 billion in 2006 constant dollars),[58] but by the time it was sent into orbit in 1990, the cost was about four times that. It is a replacement for the Hubble Space Telescope which was launched in 1990.[1]. [10] The sunshield is made of the polyimide film Kapton, which is stable at very low temperatures. This is part of a space telescope and it extends out unfolding a large metal-coated sheet of material post-launch. [112] On 27 March 2018, NASA officials announced that JWST's launch would be pushed back to May 2020 or later, and admitted that the project's costs might exceed the US$8.8 billion price tag.

[5] It is a V-groove radiator and causes a temperature drop of 300 kelvins (300 °C, 572 °F)[6] from front to back.

2010 News.