Supernova

Observed the star birth process over 485 days (until it became invisible). Tried to determine parallax but found none, suggesting it was very far away. Notion of heavenly immutability destroyed.
 Tycho Brahe Denmark 1572 Supernova

Observed the star birth process over 485 days (until it became invisible). Tried to determine parallax but found none, suggesting it was very far away. Notion of heavenly immutability destroyed.