As hinted at in the title, assuming the technology/means existed that could absorb energy fast enough, would it be possible to stop a star from going supernova, effectively “calming” it?
This is for a novel (not exactly a sci-fi one) but I’d like to keep in the realms of “technically possible”.
A requirement for supernova is a star’s total mass being above a certain threshold.
If you can imagine some way of siphoning off mass, you could do it.
One imaginable way would be to move the sun (entire system in tow) close to a black hole or larger sun or something to feed off it. This might well be a recipe for causing a bigger mess, but it might be believable. https://m.youtube.com/watch?v=v3y8AIEX_dU
Wormhole is also a scifi magic solution.