Twinkle, Twinkle, Little Planet; The Search for Alien Life  

Oleh:

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Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 403 no. 8788 (Jun. 2012), page 77-78.
Topik: International; Telescopes; Optics; Research & Development--R&D; Space Exploration

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.72 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Most astronomical telescopes employ reflection to focus starlight. But a Frenchman called Augustin-Jean Fresnel worked out that you can do it using diffraction. A set of concentric rings, alternately transparent and opaque, will scatter and spread light waves in a manner that causes them to reinforce each other some distance away, and thus form an image. The rings are known as a zone plate. And Fresnel's countryman, Laurent Koechlin, of the Midi-Pyrenees observatory, thinks zone plates are the way to find out if there is life on other planets.

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