Mount Rainier, the tallest mountain in the Cascade Range, is rendered in near silhouette as Comet C/2020 F3 (NEOWISE) and noctilucent clouds provide some light in the twilight sky in this view from High Rock in Washington state. Comet NEOWISE is a long-period comet and its current orbital path will take about 6,800 years to complete. Its nucleus is about 3 miles (5 kilometers) across and is covered with sooty, dark particles left over from its formation near the birth of our solar system 4.6 billion years ago.
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