WOW Signal
Life could be abundant in the Universe, but what about intelligence? Astronomers using radio telescopes have not yet detected messages from aliens, but the search continues. On 15 August 1977, an astronomer wrote “Wow!” on the margin of his telescope readout. He found an unusual signal that has remained unexplained ever since.
Credit:Ohio State University Radio Observatory and North American AstroPhysical Observatory (NAAPO)
