2015-05-27 BBC:星光七纪元-37（在线收听）

 And became billions of times stronger than our sun's, now as the star span, it channelled out radio signals from its north and south poles, signals that swept past earth with every rotation of the star, this was the source of the mysterious pulses, some are so regular that pulsars are among the most accurate clocks in the universe, the discovery of neutron stars was a vindication of the power of theoretical physics, it set astronomers wondering if other strange bodies that had been predicted could be lurking in space, and there is one hypothetical object that was even weirder than a neutron star. The last stage of a star's life is as much an idea of science fiction as a physical reality. Put forward by science writer Adrian in his book the Iron Sun, the suggestion is that in the future men could use black holes to transport themselves instantly around the universe, and when i say instantly, i really mean like that. For years most scientists dismissed black holes as fanciful conjecture.