Can you imagine a sky so laden with soot that all of Earth stayed dark for 2 years? New research suggests it happened, at the end of the age of the dinosaurs.
Hold out your hand for 10 seconds. A dozen electrons and muons just zipped through your palm. These cosmic rays, scientists believe, come from violent explosions in deep space. A new ScienceCast video has more.
This is a long-exposure photo of the sun, moving across the sky on August 21. Ian Hennes captured it with a lensless pinhole camera, in this case a beer can. It shows the total eclipse!
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