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Gamma Ray Observatory to Open Soon in Mexico 墨西哥建造伽马射线天文台即将开放 American and Mexican scientists have completed construction of the world's largest gamma ray observatory, situated high in central Mexicos Sierra Negra Moun
But they never got there. The first disappeared into deep space. Another missed its target when its coordinates were confused. One NASA control center was working in metric, the other in feet and inch
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Hello, I am Melissa Long at the CNN Center here in Atlanta one o'clock in the afternoon Eastern time. And here's a look at what's happening NOW IN THE NEWS. Two hundred people are out of their homes in Cedar Rapids, Iowa after fears that flood water