Here’s what you’ll learn when you read this story:Using ground-penetrating radar, researchers discovered an underground chamber containing a 500-year-old compass near Copernicus’ burial site. The compass resembles the one often depicted with Copernicus, who developed his heliocentric theory while living and working at Frombork. And now, some intrepid amateur archaeologists may have stumbled upon one of the very humble tools that once aided Copernicus in his groundbreaking work. Exploring the grounds of the religious site, also known as the Frombork Cathedral, the archaeologists employed ground-penetrating radar to uncover an underground chamber with three tunnels. It was here that they discovered a 500-year-old compass just like the one Copernicus is often depicted holding.