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For two decades, the Hubble Space Telescope provides stunning images from outer space. But nothing lasts forever, and in four years it's over with Hubble. Happily, a highly mars landing august 2012 capable successor waiting in the wings: the James Webb.
While the mirror mars landing august 2012 in the Hubble has a diameter of 2.4 meters, will the James Webb Space Telescope have a mirror on the whole 6.5 meters. Or rather, 18 mirrors, the main mirror must actually assembled from 18 smaller parts in three different configurations.
And now, six of the 18 hexagonal mirrors ready to be tested. mars landing august 2012 Today, they are transported to NASA's Marshall Space Flight Center in Alabama, where they are exposed to a temperature of minus 248 degrees Celsius. Space Telescope must for operation at this temperature in space. No repeat of the Hubble error
NASA will of course make every effort to avoid a repeat of the Hubble gaffe, where soon after the launch of the space telescope turned out that there was a mistake in the mirror. The defect was repaired by a mission in 1993, and since then four other space missions to upgrade the space telescope - the latest in May 2009.
But the Hubble floats in an orbit about 560 kilometers above the Earth's surface and therefore can be reached by shuttles, it becomes somewhat more difficult - if not impossible - to come out and repair the James Webb to be in circumference around the Sun in an orbit 1 5 million km from Earth. So everything has to work perfectly from the start.
James Webb will primarily observe infrared light from the universe of childhood - the first stars and galaxies formed after the Big Bang. But the telescope must also provide information about the formation of stars and planetary systems, and it should be paid to existing planets in our own Solar System as well as on exoplanets orbiting other stars. Danes in the project
The future space telescope is named after James E. Webb, director of NASA from 1961 to 1968, he was one of the driving mars landing august 2012 forces behind the Apollo program, and he retired a few months before the first man landed on the moon.
James Webb project is a collaboration between space agencies in Europe, USA and Canada. And Danish researchers also have a hand in it. DTU Space and company Xperion Ace asked to supply six carbon fiber rods, which would serve as the backdrop for one of the instruments on the Space Telescope.
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