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| | Red ring of light over Eastern Europe | | The enormous ring of light that appeared in the night sky on April 2 - above a thunderstorm in the Czech Republic - was a rare and fleeting lightning phenomenon. | | | | | | | | |
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| | | Red ring of light over Eastern Europe | The red ring was approximately 60 miles (100 km) wide. It happened when a pulse of electromagnetic radiation from lightning propagated up toward space and hit the base of Earth's ionosphere. Martin Popek caught this image with a low-light video camera on April 2. Used with permission. | | | | |
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| | Moon meets with star Regulus | And then, after tonight, the moon gets farther from Regulus again. Why? Because the moon is always moving in its orbit around Earth. | | | |
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