BBC地平线：来自太空的奇异信号  

For decades some have suspected that there might be others out there, intelligent beings capable of communicating with us, even visiting our world. It might sound like science fiction, but today scientists from across the globe are scouring the universe for signals from extraterrestrials. 　　In 2006, husband and wife team Duncan Lorimer and Maura McLaughlin discovered an enigmatic...