Researchers at Italy's National Institute for Astrophysics discovered a celestial map believed to be from between 1800 to 400 BC. Scientists say there's one star on it that doesn't match our sky.

Ancient map, dating back over 2,400 years, discovered in Italy. It depicts night sky and mysterious ‘problematic’ star, researchers said.

Strange 3,000-year-old stone disk unearthed in Italy could be ancient map of stars. Disk may have been used to determine time for agriculture tasks, researchers say . Vishwam Sankaran.