James Webb Space Telescope Is About To Fly: Are You Ready For The Revolution?

Guys, cross your fingers! There are still several months to the launch scheduled for next October 31, but, apparently, in front of the James Webb Space Telescope, the instrument that is about to revolutionize astronomy, has opened a fast highway, without obstacles or clouds on the horizon.
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Developed by NASA with the collaboration of the European Space Agency and the Canadian Space Agency, the Webb Telescope should have been in orbit for a few years, at least according to the initial plans of its designers, but a host of problems has raged against this project. After all, building a satellite and put it in orbit is difficult and expensive, but building a space telescope weighing 6.5 tons is enormously more so. Progressive postponements due to technical problems and various contingencies were compounded by economic ones. The planned cost in 1996 was about two billion dollars, with the launch scheduled between 2007 and 2011. A first postponement brought the cost to 4.5 billion; after that in 2011 followed a deep revision of the project, made of cancellations, reconsiderations and battles with the U.S. Congress for funding.
It is certainly true that the new space telescope will allow us to observe distant galaxies and stars with a definition never seen before, giving us the opportunity to observe the first lights that lit up the Universe, about 13.8 billion years ago, but in the end, it will cost at least $ 9.5 billion, and more than a billion will be needed for its maintenance and management of the mission once the telescope will be in orbit.
Was it worth it? You be the judge!
The proposal to build a new large space telescope, dedicating it to the memory of James Webb, NASA's director at the time of Apollo, was first floated in 1996. The idea, which still remains the basis of the project, was to offer an instrument for the observation of deep space to complement Hubble, the space telescope that for 30 years has been offering amazing and useful images for research on our solar system, the Milky Way and other galaxies.
While the James Webb Space Telescope is billed as the "successor" to the legendary Hubble Space Telescope, in a sense it is not. The Hubble is primarily an optical telescope, capturing wavelengths of light similar to those used by the human eye. But the Webb is different. It will observe entirely in the infrared. In other words, it will study a universe drawn by radiation that reaches us from space at a much higher wavelength, and that is largely invisible to human experience.
In trying to extend observations of the sky to these spectral bands, we are in fact faced with the problem of absorption by the Earth's atmosphere. In fact, only a small part of the infrared bands, the one closest to the red, is accessible to observation from Earth, while the mid and far-infrared never reach the Earth's surface. The atmosphere becomes transparent again only at wavelengths longer than about 1 mm, making observations from Earth in the radio band possible.
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Видео James Webb Space Telescope Is About To Fly: Are You Ready For The Revolution? канала Insane Curiosity