Assuming interstellar travel, and self-sufficient colonies in other star systems, what are some methods of destroying the Earth while leaving minimal impact on the colonies?
I would like to keep Earth-based culture and languages intact, without having to deal with "modern" (modern being relative to the story being told) baggage of maintaining Earth's politics and needs.
In short, I'd like to keep things like English, without forcing the inhabitants of the universe to be concerned with resources on Earth, or protecting Earth, or revisiting Earth, etc etc
What I've Considered:
I think the most probable way to knock off Earth is to wipe out the local Solar system with it. In my limited scientific knowledge, this would probably require knocking out the Sun.
Waiting for the Sun to die naturally could leave too much time for colonies to advance, significantly changing the technology, culture, and a myriad of other things.
The question then became, how do I make the Sun kick the bucket early? Perhaps collision with another body, perhaps another Star, or planet? What are the repercussions of such a collision?