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RACHEL MARTIN, HOST: Astronomers are building the world's largest digital camera to capture images of the night sky. This thing is two stories tall, a scientific marvel. So of course NPR's science correspondent Joe Palca traveled to California to che

发表于:2019-01-16 / 阅读(147) / 评论(0) 分类 2017年NPR美国国家公共电台11月
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