James Webb Space Telescope | Wikipedia audio article
Channel: wikipedia tts
Date: 18/11/2018

This is an audio version of the Wikipedia Article:
James Webb Space Telescope

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SUMMARY
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The James Webb Space Telescope (JWST) is a space telescope that will be the successor to the Hubble Space Telescope. The JWST will provide greatly improved resolution and sensitivity, and will enable a broad range of investigations across the fields of astronomy and cosmology. One of its major goals is observing some of the most distant events and objects in the universe, such as the formation of the first galaxies. These types of targets are beyond the reach of current ground- and space-based instruments. Other goals include understanding the formation of stars and planets, and direct imaging of exoplanets and novas.
The JWST's primary mirror is composed of 18 hexagonal mirror segments made of gold-coated beryllium. These combine to create a  6.5-meter (21 ft 4 in) diameter mirror that is much larger than the Hubble's 2.4-meter (7.9 ft) mirror.  Unlike the Hubble—which observes in the near ultraviolet, visible, and near infrared (0.1 to 1 μm) spectra—the JWST will observe in a lower range of long-wavelength visible light through mid-infrared (0.6 to 27 μm). This will allow the JWST to observe high redshift objects that are too old and too distant for the Hubble and other earlier instruments to observe. The telescope must be kept very cold to observe in the infrared without interference, so it will be deployed in space near the Earth–Sun L2 Lagrangian point, and a large sunshield made of five sheets of silicon- and aluminum-coated Kapton will keep JWST's mirror and four science instruments below 50 K (−220 °C; −370 °F).
The JWST is being developed by NASA—with significant contributions from the Canadian Space Agency and the European Space Agency—and is named after James E. Webb, the American government official who was the administrator of NASA from 1961 to 1968 and played an integral role in the Apollo program. Development began in 1996, but the project has had numerous delays and cost overruns, and underwent a major redesign during 2005. In December 2016, NASA announced that construction of the JWST was complete and that its extensive testing phase would begin. In March 2018, NASA delayed the JWST's launch after the telescope's sunshield ripped during a practice deployment. The JWST's launch was delayed again in June 2018 following recommendations from an independent review board, and is currently scheduled for March 2021.