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The James Webb Space Telescope

The James Webb Space Telescope

These mirrors will allow us to observe the birth of the Universe. Yes, really. For it to work as a telescope it would require a housing with a collector (secondary mirror). Otherwise you have orbit's largest mirror, not a telescope. It seems though, the housing in this case is 4 open sides held by poles. I worked on JWST for three years as a Systems Engineer at Northrop Grumman (the prime contractor for the Observatory). Interesting stuff. Sure, they'll be able to upgrade the sensors and software and whatnot, but it's hard to imagine a way to service the mirrors via spacewalk (though it is amusing to picture an astronaut out there with a squeegee and bucket). The Hubble has been the gift that keeps on giving, and really NASA has a reputation going of its projects far outlasting their planned usefulness, whether they by satellites or rovers. Thanks for answering my question. Barring massive, rapid advances in human spaceflight, nobody will be upgrading the sensors on JWST.

The James Webb Space Telescope About Webb's Orbit The James Webb Space Telescope will observe primarily the infrared light from faint and very distant objects. But all objects, including telescopes, also emit infrared light. To avoid swamping the very faint astronomical signals with radiation from the telescope, the telescope and its instruments must be very cold. Therefore, Webb has a large shield that blocks the light from the Sun, Earth, and Moon, which otherwise would heat up the telescope, and interfere with the observations. The L2 orbit is an elliptical orbit about the semi-stable second Lagrange point . In three of the solutions found by Lagrange, the bodies are in line (L1, L2, and L3); in the other two, the bodies are at the points of equilateral triangles (L4 and L5). In the case of Webb, the 3 bodies involved are the Sun, the Earth and the Webb. Other infrared missions have selected an L2 orbit, like WMAP and H2L2. Here are a few graphics that illustrate how far away Webb will be.

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Le James Webb Telescope a franchi une étape clé dans les tests - Sciencesetavenir.fr RESISTANCE. Le James Webb Space Telescope (JWST), avec son miroir de 6,5 mètres de diamètre, sera le télescope le plus puissant jamais envoyé dans l'espace. Sa sensibilité est cent fois plus grande que celle du télescope Hubble, lancé en 1990 et qui avait révolutionné l'astronomie. Grâce à ce nouvel instrument, les astronomes pourront remonter encore plus loin dans l'histoire de l'Univers, jusqu'à 300 millions d'années après le Big bang, période à laquelle sont apparues les premières étoiles dont la traque se poursuit toujours avec d'autres outils. Aujourd'hui le télescope est complètement achevé et les techniciens lui font passer de multiples tests pour s'assurer de la solidité et de la fiabilité de son miroir notamment. Les tests acoustiques. La dernière série de tests effectuée visait à évaluer la résistance du télescope à son lancement, qui s'effectuera à bord d'une fusée Ariane V. Au final, le télescope a bien supporté toutes les contraintes auxquelles il a été exposé.

Facebook bulletins-electroniques.com : toute l'actualité technologique internationale en français, en accès libre et gratuit ! Le télescope spatial James-Webb menacé de piratage et de kidnapping ? Un acte de piraterie est-il à craindre lors du transfert du télescope James-Webb à Kourou ? Si cette information peut faire sourire, elle semble prise au sérieux par les responsables du programme comme le relate la revue américaine The Atlantic. Avec près de dix ans de retard sur son planning initial qui prévoyait un lancement avant la décennie 2010 et un budget qui approche les 10 milliards de dollars, l'observatoire spatial James-Webb (JWST) nous en aura fait voir de toutes les couleurs. Depuis le début de son développement, on a eu droit à certes d'indéniables difficultés techniques mais aussi à des erreurs humaines, des nouvelles technologies insuffisamment maîtrisées, un optimisme excessif dans le calendrier du déroulement du programme et des dépassements budgétaires. On pensait que les conséquences de la pandémie mondiale de la Covid-19 seraient les derniers soubresauts d'un programme qui a été proche de l'annulation en cours de développement.

The Earth's most powerful telescope goes online next week The Moon is a particularly good place to do neutrino physics because of the the cosmic ray backgrounds underground. On Earth, at sea level, cosmic rays are mostly due to high-energy protons interacting with the upper atmosphere. These collisions create a lot of pions. Because the atmosphere isn't very dense, these pions don't slow down very quickly, and so when they decay into muons the muons are still extremely energetic. Muons are highly penetrating particles, so even when we build neutrino detectors kilometres underground we have to deal with a very significant cosmic-ray muon background signal. On the Moon, with no atmosphere to speak of, the primary cosmic-ray protons smack into solid rock, so the pions are created in that very dense medium and almost all of them slow way down before decaying, so the muons only have the muons are much lower energy and penetrate a very short distance.

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