While I agree that Dyson spheres are a possible interpretation, the wording of the prophecy doesn't make them a likely candidate:
HE IS HERE. THE ONE WHO WILL TEAR APART THE VERY STARS IN HEAVEN. HE IS HERE. HE IS THE END OF THE WORLD
From the vantage point of view of an observer on Earth, a Dyson sphere would likely appear to extinguish stars outside it (assuming we are talking about a version that is impermeable to light from either side). Tearing apart doesn't sound like a probable description. Note that the prophecy talks of the end of the world, which again can be better explained by the end of the timeline/reality hypothesis rather than a Dyson sphere
Astroid mining? There's some room for interpretation here on the meaning of "star". Plus I wouldn't rule out stars themselves eventually being mined for resources, e.g. by triggering coronal mass ejections.
New chapter!
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 102.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: