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'Lunar halo' creates ring around the moon over St. Louis Tuesday night. Here's what caused it
The visual effect is known as a lunar halo or a 22-degree halo, and it's caused by light from the moon hitting millions of ...
A moderate solar flare might affect radio communications on Earth, the National Oceanic and Atmospheric Administration said ...
Researchers have detected a black hole consuming a massive star, marking the largest burst of light from a black hole ever observed.
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