The James Webb Space Telescope is a space telescope designed primarily to conduct infrared astronomy. The U.S. National Aeronautics and Space Administration led development of the telescope in collaboration with the European Space Agency and the Canadian Space Agency. JWST is orbiting around one Lagrangian point located on the far side of the Earth further from the Sun, called L2. In this position, as Earth moves around the star, JWST will follow the planet almost in lockstep, like a constant companion always in the same location in relation to our planet. The James Webb Space Telescope is the world's largest, most powerful, and most complex space science telescope ever built. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Hubble is 13.2 metres (43.5 ft.) long and its maximum diameter is 4.2 metres (14 ft.) It is about the size of a large truck. The most powerful space telescope ever launched just fired its thrusters to reach its permanent cosmic address. With this final course adjustment complete, the James Webb Space Telescope (JWST) is now orbiting around the sun at a distance of nearly 1 million miles (1.5 million kilometers) from Earth. Unlike Hubble, it will be able to see right into stellar nurseries, where stars and their planetary systems are being born. The observations will answer questions about how the clouds of dust and gas collapse to form stars and how planetary systems form around them. Webb's mission lifetime after launch is designed to be at least 5-1/2 years, and could last longer than 10 years. The primary mirror segments will at first be off by millimeters, which is a large degree of imprecision when it comes to honing in on a distant exoplanet or seeing the stars in a faraway galaxy. After separating from its launch vehicle, JWST began to slow rapidly and it is now traveling at a cruising speed of around 0.2 miles per second towards L2, or roughly 720 miles per hour. This is because the gravity of the Earth and sun slow the observatory down as it moves away from our planet. Launch date: Dec. 25, 2021. Cost (at time of launch): $10 billion. Orbit: JWST will orbit the sun, around the second Lagrange point (L2), nearly 1 million miles (1.5 million kilometers) from Earth. With the James Webb Space Telescope, rescue missions are impossible and therefore no failures are allowed. "That's why JWST is so expensive. Because we've spent two decades building and testing every single piece a million ways to do everything to make sure it doesn't have problems."The James Webb Space Telescope (JWST) has taken 30 years and $10bn (£7.5bn) to develop, and is being described as one of the grand scientific endeavours of the 21st Century. JWST is now orbiting around an invisible point in space known as an Earth-Sun Lagrange point. It's a somewhat mystical area of space where the gravity and centripetal forces of the Sun and the Earth are just right, allowing objects to remain in a relatively “stable” position. Webb will be able to see what the universe looked like around a quarter of a billion years (possibly back to 100 million years) after the Big Bang, when the first stars and galaxies started to form. Being arguably the most successful telescope of all time comes at a cost. Its original building costs of more than US $2 billion are exceeded only by the upcoming James Webb Space Telescope, and the total running costs of Hubble have now far exceeded US $10 billion. And the successor of the jwst is luvoir telescope.

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