User blog comment:Admiral Phoenix/The Arda System/@comment-27797576-20150227171521/@comment-12161342-20150228182102

It would not, owl. It would more than likely ignite any fusile elements within the planet, making it a star, and therefore outward pressure from the fusion would keep it from imploding. If it was made primarily of heavy transiron elements, however, its anyones guess as to what would happen.