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.

Researchers found what they believe is a 2,000-year-old map of the stars The star catalog was made by ancient Greek astronomer Hipparchus around 162 and 127 BCE, 1,400 years before the telescope.