Polish archeologists have solved a centuries-old mystery and have discovered the grave of 16th century astronomer Nicolaus Copernicus.

The Polish astronomer, who died in 1543 challenged the ancient belief the sun revolved around the earth, was buried at the Roman Catholic cathedral in the city of Frombork, 180-miles north of Warsaw.

Jerzy Gassowski, head of an archaeology and anthropology institute in Pultusk, tells the Associated Press, "We can be almost 100-percent sure this is Copernicus."

He adds the grave was in bad condition and not all remains were found. He also states his team will try to find relatives of Copernicus to do more accurate DNA identification.

Copernicus says to be the founder of modern astronomy. Before challenging the belief the sun revolved around the earth, he studied at Krakow University, studying mathematics and optics, and later studied canon law at Bologna.