What two primary factors significantly dictate the structure and ultimate fate of an expanding supernova remnant bubble?
Answer
The energy released in the blast and the density/distribution of the surrounding material
The structure and lifespan are governed by the energy of the initial explosion, which sets the speed, and the density and distribution of the surrounding interstellar material, which dictates drag and shape.

Related Questions
What is the material left behind after a supernova explosion specifically called?What process creates the powerful shock wave associated with a supernova remnant?Approximately how long can the physical evolution of a supernova remnant persist?Which type of supernova results from the complete obliteration of a white dwarf star in a binary system?What characteristic of a supernova remnant causes it to glow intensely in X-rays?In the radio spectrum, what process is responsible for the signals observed from older supernova remnants?Which morphological class of supernova remnant shows strong radio emission overlying thermal X-ray emission?What is the fundamental role of supernova remnants regarding galactic chemistry?What two primary factors significantly dictate the structure and ultimate fate of an expanding supernova remnant bubble?What phenomenon are supernova remnants thought to be the primary acceleration mechanism for?The Crab Nebula originates from a supernova observed around what year?What structural feature often characterizes Mixed-Morphology (MM) supernova remnants when viewed in X-rays?