HEADLINES:
Indian Army successfully test fires Agni-II IRBM for the third time। Agni-II is nuclear capable। The firing on February 20 in full operational configuration। DAC clears proposals worth Rs 15,935 Cr (approx $2.2b) । The approval covers purchae of Rifles, Carbines and Light Machine Guns for the Army, Navy and Air Force । New weapons are required by the Indian Army’s for effective engagement of Pakistani infiltrations । Leading Pakistani human rights activist Asma Jahangir passes away । Globally respected for her liberal views, she was a strong pro-democracy activist । SpaceX Launches the World’s Most Powerful Rocket, and aboard it, Mr Musk’s electric red sports Car । “It’s kind of silly and fun, but silly and fun things are important,” he said Feb 6। Mr Elon Musk owns both SpaceX, the world’s biggest space company, as well as Tesla cars। SpaceX’s Falcon 9 rocket has ferried payload to Space Station but this time, rocket is turbocharged। For the first time, NASA was not involved in launching such a heavy rocket। Singapore Airshow Opens Feb 6 । Boeing, Lockheed Martin, Raytheon, Airbus, Sikorsky, and the global biggies are taking part । Honeywell Provides Fuel Made From Mustard Seeds For Trans-Pacific Flight । Russia views India as a Privileged Partner, says Rostec CEO Chemezov । US Carrier Carl Vinson to make first ever visit to Vietnam in March । Carl Vinson woll dock at Da Nang, apparently boosting bilateral military cooperation । Happy Republic Day to All Indians । Emirates signs agreement for up to 36 additional A380s । India successfully test fires 5000-Km A380s ICBM। Defexpo to be held April 11-15 in Tamil Nadu, India’s southern state। HAL receives RfP for 83 LCA Tejas from IAF। The new LCAs will have AESA combat Radar। IAF had announced the decision for new LCAs sometime back। INS Kalvari commissioned into Indian Navy December 14। Prime Minister Modi ceremonially inducted the Scorpene class boat in Mumbai। Built by state-run MDL with French collaboration, Kalvari is the first submarine inducted after 2000। Modi described the Kalvari as a fine example of Make in India। Five more Kalvari Class submarines are to be commissioned over the next couple of years।
February 25, 2018
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Sunshield Deployment and Layers Fully Tensioned on NASA’s James Webb Space Telescope

Published: October 2017
 

REDONDO BEACH, Calif. – October 26, 2017: Northrop Grumman Corporation, which designed NASA’s James Webb Space Telescope’s (JWST) optics, spacecraft bus, and sunshield for NASA Goddard Space Flight Center, has deployed the sunshield subsystem and fully tensioned the five sunshield layers for the first time.

Sunshield+Deployment+and+Layers+Fully“The first tensioning of the sunshield is a monumental and exciting moment, not only for the program but for the collaborative JWST team,” said Scott Willoughby, vice president and program manager, James Webb Space Telescope, Northrop Grumman Aerospace Systems “The innovative sunshield is an industry first, and will protect Webb’s optics from heat, making it possible to gather images of the formation of the first stars and galaxies more than 13.5 billion years ago.”

In space, the sunshield subsystem divides the JWST observatory into a warm sun-facing side and a cold space-facing side comprised of the optics and scientific instruments. The sunshield subsystem, which includes the structure and mechanisms required for deploying the five-layer subsystem, was designed, manufactured and assembled by Northrop Grumman, with the five membrane layers manufactured by the NeXolve Corporation in Huntsville, Alabama.

The flight membranes will be folded, stowed and tensioned again two additional times for testing. The folding and stowing method is how the membranes will be folded and stowed for launch. The sunshield layers, known for being the size of a tennis court, will protect and prevent the background heat from the Sun, Earth and Moon from interfering with JWST’s infrared sensors.

The sunshield layers, each as thin as a human hair, work together to reduce the temperatures between the hot and cold sides of the observatory by approximately 570 degrees Fahrenheit. Moving from the sun-facing layer to the one closest to the telescope, each successive layer of the sunshield, which is made of Kapton, is cooler than the one below. The sunshield, along with the rest of the spacecraft, will fold origami-style into an Ariane 5 rocket.

The James Webb Space Telescope, the scientific complement to NASA’s Hubble Space Telescope, will be the premier space observatory of the next decade. Webb is an international project led by NASA with its partners, the European Space Agency and the Canadian Space Agency.

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