scientist might be giving up on the notion of sending ridiculously large pieces of deoxyephedrine into blank . Using a Fresnel - zona genus Lens instead , astronomers at Observatoire Midi Pyrenees in France propose to take highly high - line images at vast distance without a large electron lens or mirror . A 30 - meter Fresnel scope will provide visual substantiation of Earth - like planets up to 30 low-cal years away . Since it can also observe a wide spectrum range including UV and IR , it can do comply - up espial of life story signs , too . The main reward of the Fresnel telescope is , of course , the fact that it ’s a perforated sheet of roll - up alloy instead of heavy , breakable drinking glass . But there are some major reason it ’s not super well-situated to just whip up one of these scope in the machine shop :
Though a Fresnel detector has the same edge as a glass lens , it only collects about 10 % of the light . That ’s why the sheet has to be really really bounteous , like the 30 - meter one cite above . Even worse , the Fresnel lens bring light to focus far away from its own surface . A 30 - m panel may require a spaceship with secondary electron lens and television camera located several km away to delineate up within a few millimeters to capture the image precisely on tv camera . That ’s some dodgy flying , and would require a set of energy , especially when the panel itself is perpetually tilting to depend at young , marvellous thing . [ New ScientistviaKurzweil AI ]
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