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Tonight … Moon and star Antares | | It looks like a dot of light near the moon. But the humongous size of this red supergiant star is truly difficult to fathom. | | |
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Mystery of high-energy cosmic rays | | 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. | | |
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