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Is anyone out there? For over 40 years scientists have been searching for extraterrestrial intelligence, but theyve found nothing. Now the new Allen Telescope Array, a string of 350 radio telescopes, is being built 300 miles north of San Francisco a
发表于:2018-12-30 / 阅读(198) / 评论(0)
国家地理2008年
国家地理2008年
Ok, imagine you are at the beach, in order to figure out if there are fish in the ocean, you dip an empty glass into the water and look inside. No fish in the glass? Well, there must be no fish in the ocean. Not too logical, is it? But that's exactly
发表于:2019-01-22 / 阅读(206) / 评论(0)
自然百科2008年
自然百科2008年