* Constellations are patterns, not physical groupings: Constellations are imaginary shapes we draw in the sky based on the positions of stars. These stars are often vastly different distances from us and each other. A star exploding in one constellation won't affect the positions of the other stars in that pattern.
* The star's death is visible: A star's explosion, called a supernova, is a spectacular and extremely bright event. It might temporarily make the constellation more prominent, as the supernova outshines its neighboring stars.
* The pattern changes over time: Stars are constantly moving. While the changes are slow over human lifetimes, over thousands or millions of years, the patterns of constellations will shift as stars drift. A supernova, while dramatic, won't change this gradual evolution.
* The constellation's name might stick around: Even if the supernova drastically changes the appearance of the constellation, the name might remain. For example, if the star Betelgeuse in Orion went supernova, Orion might look very different, but we'd likely still call it Orion for historical reasons.
In short: A supernova is a dramatic event, but it won't fundamentally change the constellation itself. The pattern of stars we see in the sky will continue to change gradually over time, as stars move and evolve.
