Archeologists in Italy made a surprising discovery of two stone disks covered in chisel marks at an ancient fort. After examining the marks, astronomers matched them to the positions of 28 bright stars in the sky, including Orion's Belt. Since stars move, the marks must have been made between 1800 and 400 BCE, making it one of the oldest sky maps ever found. An outstanding mystery is one chisel mark that doesn't match a known star and might have marked a supernova.




