Unusual light patterns created by a distant star may be a sign of alien life. A group of American astronomers investigating unusual data from a telescope say the periodic dimming of a distant star - known as KIC 846-2852 - could point to the possibility of what they're calling an 'alien megastructure'.
For scientists to even consider any theory invovling extraterrestrial civilizations is pretty extraorindary but the story of KIC 846-2852 is so puzzling they're not ruling it out. This star flickers - light years away - and its light levels drop like no other twinkling body. Newsday spoke to Andrew Siemion, the director of the Search for Extraterrestrial Intelligence Research Center at the University of California, Berkeley.
To view the BBC video, click here.