Life Beyond Earth

Astronomers Say Advanced Alien Civilizations Have Existed

A bright star-forming ring that surrounds the heart of barred spiral galaxy NGC 1097 in this file photo. (NASA)
A bright star-forming ring that surrounds the heart of barred spiral galaxy NGC 1097 in this file photo. (NASA)

Astronomers Adam Frank and Woodruff Sullivan, at the University of Rochester and the University of Washington respectively, published a paper in the May issue of...



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