A giant arc of galaxies appears to stretch across more than 3 billion light-years in the distant universe. If the arc turns out to be real, it would challenge a bedrock assumption of cosmology ...

New study sheds light on the previously overlooked Mongolian Arc—a monumental wall system in eastern Mongolia spanning 405 kilometers. This discovery not only reveals the significance of this ...

China isn’t the only place on earth with a "Great Wall." So is Mongolia, about 2,700 kilometers from its southern neighbor's.. Mongolian researchers have teamed up with colleagues from – of ...