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Fraunhofer lines – Absorption lines, which can be observed against the background of a continuous spectrum of the Sun and stars, have dark lines.
Fraunhofer lines
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Fraunhofer lines – Absorption lines, which can be observed against the background of a continuous spectrum of the Sun and stars, have dark lines.
Lewis Carroll writes about military space programmes, policy, technology and the industry that supports the sector. He spent nearly two decades covering the military, the Pentagon, Congress and the defence industry as a journalist for Space Chatter magazine.