From the article:

  "Black holes, if you recall, are created when stars run out of fuel and die. In dying, they collapse into a much smaller mass with such enormous gravity that it sucks in just about anything that comes light years near it."

I may be wrong, but doesn't the mass of the black hole roughly equal the mass of the star? I know some is lost during the explosion, but I thought the mass stayed roughly the same and just the volume significantly decreased.