What are the key differences between a type 1a supernova and a type 2 supernova?

Sweetie, the key differences between a type 1a supernova and a type 2 supernova lie in their origins. Type 1a supernovae happen in binary star systems when one star sucks the life out of its companion until it explodes, while type 2 supernovae occur when a massive star runs out of fuel and collapses on itself. So, in a nutshell, one involves stealing and the other is a dramatic burnout - sounds like my love life in my 20s.