Most of us know the Death Star from Star Wars - a huge planet like structure built in order to destroy planets (160 km in diameter Google says). Now building something that big seems like an overkill.
I could imagine that a civilisation, somewhat more advanced than ours (like Type II advanced) could build something less bulky. With the idea of planet destruction in mind, I would propose a mesh of small (like a big house small) satellites that would form a net over the planet. Then they would simultaneously hit the planet with the energy beams the draw from the Sun, causing it to overheat and well, just crack and fall apart.
How scientifically plausible is this idea? How many satellites would be plausibly needed? If you think this idea, scientifically thinking, is crap, how would your planet killing machine of a small to medium size look like? (we are talking about like big starships at most,nothing Moon-big)