Second mirror James Webb Telescope is installed




The second mirror of the James Webb telescope is installed. With this, both mirror surfaces are arranged. The construction of the first mirror was completed on February 3 with the placement of the last segment of eighteen mirror parts.

Ariane 5 James Webb The James Webb telescope mirror, which ultimately must stand at about 1.5 million kilometers away at a fixed point from the earth, will particularly examine larger wavelengths than the current Hubble Space Telescope. The last quarter a year ago, twenty-fifth anniversary at about 570 kilometers from the Earth in space.

The Webb telescope is lighter and larger than its predecessor. The large, segmented mirror first instance, all 6.5 meters in diameter at 2.7 meters from Hubble. The whole must be folded to fit into an Ariane 5 rocket.

In contrast to the eighteen segments of the first mirror which has a honeycomb structure, is the second mirror around and convex so that the reflected light that is reflected off that it arrives in the middle of the first mirror, in which a third system with a mirror sits that provides for stabilization. Then, the collected light on the instrument end up.

The mirrors are made of beryllium, a material which is very rigid, light and stable under extremely low temperatures. The deviation is no more than a few millionths of a millimeter at temperatures in the room. Because beryllium does not reflect very well, all the mirrors have a gold coating to reflect infrared light well. Webb can thus look further into the past than Hubble. One of the main goals of the scientific mission Webb is also searching for light from the first stars and galaxies that formed in the universe after the Big Bang. These observations can be done better in the near infrared than in visible light. Hubble example, looking at visible or ultraviolet light. Webb will be able to detect wavelengths between 0.6 and 28 micrometer, 0.6 micrometer which is the wavelength of orange light.

The James Webb telescope will cost more than budgeted. At first had the whole in 2011, the space go and the cost of the project was budgeted at $ 1.6 billion. Now the goal is to have the telescope in 2018 in the space and should not cost more than $ 8 billion.


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