I had already figured out how to do the planet's crust melting (it's not Earth.). I've known how to do the effect since I worked on an earlier project, Xprrrah System (don't ask) where a massive (Earth-sized) space station melted a planet. I had one object that was the planet and a second one where the planet was melted. I simply expanded the molten sphere. I later edited that out as I wanted to try it with Terragen, but still later (months) my computer crashed and I had to get my hard drive wiped and Windows installed again. In the process, I lost EVERYTHING.
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For the jet of energy, I wanted to show it from many angles and thus make it 3D. Anyway, for the explosion, I wanted to simply have it expand into a bright fireball, accompanied by sound effects, then have it shrink and emit a huge shockwave that hits the camera, then use WMM effects to fade to white and fade to the scene with a debris field replacing the planet. The problem I need a solution for is the jet fanning out after hitting the planet. All the other stuff I know how to do already.