12th
-
Scientists Find Supernova That Wowed Ancient Astronomers In 12th Century
In 1181, a supernova explosion appeared in the night sky for 185 days. Historical records show that the supernova, which…
Read More » -
Notre Dame cathedral first to use iron reinforcements in 12th century
Enlarge / The Notre-Dame de Paris has been under restoration since a devastating fire destroyed the main spire and roof…
Read More »