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Radical Plan to Beam 'Sunlight on Demand' at Night Sparks Concerns

A proposed constellation of satellites has astronomers very worried.

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Plan to Reflect Sunlight to Power Solar Panels at Night Upsets Astronomers

Fragments of Bacteria in Our Gut May Lull Our Brains to Sleep at Night

Science history: On the night of Oct. 5, 1923, Edwin Hubble observed a strange star that flickered in intensity at regular intervals. The star, dubbed M31-V1, was key to showing that the universe extended far beyond the borders of the Milky Way.

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