A swirling disk of material forms around the hole--a maelstrom deep within the doomed star. "Rotation is the name of the game," says Woosley. Without spin, there would be no disk. And without a disk, there'd be no burst. Friction heats the disk, whipping around the black hole thousands of times a second, to 40 billion degrees (22 billion degrees Celsius), while new material keeps cascading in. Moments after the black hole forms, jets of superheated gas blowtorch outward. Each jet may draw its energy directly from the friction in the disk, or from the newborn black hole, via the magnetic fields that link it to its surroundings. Like the original star, the black hole spins frenetically, which could cause the fields to stretch, twist, and snap like rubber bands, dumping vast amounts of energy into the disk. Either way, the jet shoots outward, reaching the surface of the star in a mere ten seconds. If the
understand the breadth of careers out there. "Sometimes I get people coming to me saying something like, 'I just know I want to work with animals.' They go away amazed at the opportunities available." You might even like your new role so much that your partner decides to copy you. When Chris Oldale, 43, an HR manager, went on a taster course about becoming a gas engineer, he took his wife, 49, along. "What I had not expected was to see her getting stuck in with a blowtorch. She wound up liking it so much that she gave up her IT job to join me in my career change." The same happened with Annie and Paul Clayton, both 42. "We both worked in the police for nearly 20 years," says Annie. "But Paul had become disillusioned and had a friend who was a tree surgeon. He started helping him out and he loved it, so he gave up the police. I'd turn up with sandwiches and realised I loved it too, so now we run a business together."
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