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Rho Ophiuchi dark cloud is one of the closest star-forming regions to our own solar system. Located near the constellations Scorpius and Ophiuchus, the nebula is about 407 light years away from Earth. The infrared astronomical satellite, now celebra
国家地理2008年
By Margaret Besheer Baghdad 24 December 2006 In Iraq, American troops have many missions. At the American Forces Network headquarters in Baghdad's Green Zone, broadcasters and disc jockey soldiers are helping to keep America's 140,000 troops across
2006年VOA标准英语（十二月）
反射星云是靠反射附近恒星的光线而发光的，呈蓝色。反射星云的光度较暗弱，较容易观测到的例子是围绕着金牛座M45七姊妹星团的反射星云，在透明度高及无月的晚上，利用望远镜便可看到
托福英语
今天我们要学的词是 extended。Extended 是形容词，延长的，长期的。He has been on extended sick leave since this summer. 他因为生病，从今年夏天就开始休长假。圣诞节前，Many retail stores are offering extended
英语单词荟萃
It looks like a hand of God reaching out into the cosmos, but NASA says the display is caused by a young and powerful pulsar. Taken by NASA's Chandra X-ray observatory from it's orbiting 360 miles above the Earth, the recently released photo of Pulsa
实用英语
The ceasefire in the northern Syrian city of Aleppo that was due to expire last night has been extended by 48 hours. The extension comes after nearly 300 deaths in the city since the end of last month. Increased violence wrecked the 10-week-old parti
cctv9英语新闻2016年