When a star explodes at the end of its lifetime, it smears the elements forged in its heart across vast stretches of space. The results, dramatic designs of gas and dust known as supernova remnants, contain structures that have long puzzled researchers. But supernovae occur in the Milky Way only once or twice a century, often without warning, making it difficult to study their initial moments. Researchers have modeled these events through simulations, but computing limitations require them to make assumptions about the finer details.