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Hubble Space Telescope to be replaced by Webb Space Telescope in 2018
The James Webb Space Telescope (JWST), previously known as Next Generation Space Telescope (NGST), that was supposed to replace Hubble Space Telescope in 2013 is now scheduled to be launched in 2018. The JWST is said to be still under construction.

According to scientists, JWST will have a segmented 6.5-meter diameter primary mirror and will be located near the Earth-Sun L2 point. It will have an extra-large sunshield to keep its mirror and scientific instruments below 50 K (-220 °C) temperatures.

It is said that JWST's capabilities will help cosmologists and astronomers to observe some of the most distant objects in the Universe, beyond the reach of current ground and space based instruments in existing space telescopes.

After about years of use the Hubble Space Telescope will be phased out. The Hubble telescope, dubbed as a $2bn "technoturkey", will be abandoned in the space.

Orbiting at 380 miles above the Earth's surface Hubble Space Telescope has been described as NASA's most successful missions. It took hundreds of thousands of most outstanding images of planets, stars, nebulae, galaxies.

Our galaxy, the Milky Way with over 400bn stars, is just one of about a hundred billion galaxies spread all over the universe.

Based on data gathered by the Hubble Space Telescope, scientists now believe that the universe is about 13.7bn years old.

The much more powerful Webb Space Telescope, is being designed to see in infra-red region to provide deeper understanding of the universe.

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