Corrected entry: The Ori plans on collapsing a planet to form a black-hole, unfortunately you need a really big sun (several times more massive than our sun) before it will do this, there's no way a planet will naturally form a black-hole.
Soylent Purple
15th Feb 2006
Correction: Any object of sufficient mass will form a black hole. As you point out it would need to be several times the mass of our sun. Perhaps he planned to put a stargate on the planet and send a super-dense material through.
Soylent Purple
The key phrase was "naturally form a black-hole." The Ori used technology to super-compress the planet to achieve an unnatural result, so the question of mass is misleading.