| 翻訳と辞書 |
| FOCAL (spacecraft) ： ウィキペディア英語版 |
FOCAL (spacecraft)
FOCAL is a proposed space telescope that would use the Sun as its gravity lens, through the Solar lens effect. The mission was first suggested by professor Von Eshleman, and developed in detail by Italian astronomer Claudio Maccone.
In order to use the Sun as a gravity lens, it would be necessary to send the telescope 550 astronomical units away from the Sun,〔 enabling very high signal amplifications: for example, at the 203 GHz wavelength, amplification of 1.3·1015. This should be enough to obtain detailed images of the surfaces of extrasolar planets.
Even without using the Sun as the lens, FOCAL could perform various, otherwise impossible measurements: a telescope could be used to measure stellar distances by parallax, which would, using the baseline of 550AU, measure the precise position of every star in the Milky Way,〔 enabling various further scientific discoveries.〔 It could also study the interstellar medium,〔 the heliosphere,〔 observe gravity waves,〔 check for the possible variation of the gravitational constant,〔 observe the cosmic infrared background,〔 characterise interplanetary dust within the Solar system,〔 more precisely measure the mass of the Solar system〔 and similar.
== Limitations ==
FOCAL does not require any non-existing technology, however it has various limitations. A space mission of this duration and distance has never been attempted. A gravity lens will bend objects behind it, so that images from the telescope would be difficult to interpret.〔 FOCAL would be able to observe only objects that are right behind the Sun from its point of view, which means that for every observed object a new telescope would have to be made.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「FOCAL (spacecraft)」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|