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The radio sun

22 Feb 2015, 00:00 UTC
The radio sun
(200 words excerpt, click title or image to see full post)

Athletes, police, and warriors hate having the sun in their eyes but at an opponent's back. It turns out, the sun can blind you and aid your enemy even in invisible wavelengths. The Allies faced that challenge in World War II. Continue reading →

¡SkyCaramba! Weekly astronomy blog for the week ending February 28, 2015
Athletes, police, and warriors hate having the sun in their eyes but at an opponent’s back. It turns out, the sun can blind you and aid your enemy even in invisible wavelengths. The Allies faced that challenge in World War II.
Previously fairly safe from invasion because of the English Channel, Great Britain became more vulnerable in the 1900s. German dirigibles maneuvered just as easily in the air over land and sea, and they dropped bombs on Britain in World War I. German airplanes did it faster and more frequently in World War II. For a heads-up about incoming bombers, the British took some ideas with German roots older than both wars.
Heinrich Hertz, who studied radio waves in the 1880s, discovered they bounced off some objects. His experiments also showed that radio waves refract through the atmosphere. That’s how scientists learned radio waves and ...

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