In this case, I don't mean "make the Earth uninhabitable", I mean "make the Earth a debris field". This has been asked before, of course, but the answers always seem be be some form of "throw a really big rock at it". Although really big rocks are effective, they also get kind of boring after a while.
So, is there a way to destroy the Earth that doesn't throw rocks?
There are three rules:
- This is meant to fit into an alien attack-style scenario (albeit a very loosely defined one). Any methods you come up with must be able to destroy the Earth fast enough that we would have no time to react - probably a few days, maybe a week at most.
- Everything involved must be at least theoretically possible, without any blatant handwaving.
- To keep things interesting, technology so advanced it would make this trivial is not allowed. Anything in Kardashev Tier 2 (or below) will most likely be fine, but Tier 3 and above is off-limits.