Science: Electron Astronomy

The huge, complex telescopes of modern astronomy have a simple purpose: to concentrate light. Their mirrors (up to 200 inches in diameter) and lenses catch a wide bundle of light rays from faint stars or nebulae and cram them together at a small focus on a sensitized plate. Last week two French astronomers, Andre Lallemand and Maurice Duchesnes, were showing off a new wrinkle in astrophotography. Instead of depending on the original starlight to make the photographic impression, they plan to amplify the light's energy before it reaches the plate.

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