May
10
About The Telescope - Technology and science News
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Telescopes used in astronomy, usually focus light using mirrors. But there are limits the size of mirrors, which can be sent into space. Therefore, sending a large and heavy objects into orbit expensive, and limited capacity on launch vehicles. But scientists are experimenting with other ways to focus the light. This does not require a large primary mirrors or lenses, although used in the construction of the secondary mirror or lens smaller size. The construction uses wave nature of light, which makes light bending around the edge of the facility.
This means that light can be simply focused on the image that comes through a certain pattern of holes made by the opaque plate. Such plates long been used to focus laser beams, but so far not been used in astronomy. These are called plates zone Fresnel, French physicist in honor Ogastina-Jean Fresnel, who studied in the diffraction in 1800 But the group, headed by the Lorentom Koechlinom , working in the Observatory in Toulouse, said that a powerful “block imaging Fresnel” you can create, to take part metal foil, combine it with a sheet of Fresnel and attach to the firm frame, and then start construction in space. Spacecraft equipped with a camera and other scientific devices will be placed in orbit and to observe celestial objects.
Since the construction uses mirrors instead of large plates of metal foil, it is much easier and cheaper than conventional telescopes. Block imaging Fresnel with a sheet of a certain size also sees far as conventional telescopes with a mirror of the same size. Observations also can be made in the infrared, ultraviolet and other types of radiation. The telescope may consider very distant objects with a high contrast, who need to see a very weak object, which is located near the bright stars.
30-metre telescope Fresnel powerful enough to see planets the size of Earth, which are at a distance of 30 light-years from Earth, and measure some parameters of planets, to search for life on them, such as the availability of oxygen in the atmosphere. Also, it can show the image of young galaxies, which are very far in the universe, and to make detailed images of objects in our solar system. And while the new telescope is easier than usual, will simplify its structure. Before running high, 30 - meter mirror of the need to foil any way to lay down, and then, moving him into orbit, to deploy.
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