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The little green man from outer space
¡@When a massive star burns up its fuel, it ends its life in an extravagant show, a supernova explosion, exhaling matters into space and leaving behind a super dense core that we call a neutron star. In 1967 Jocelyn Bell, using a primitive antenna, found a faint but regular signal, which she dubbed "Little Green Man 1", in the direction of the constellation Vulpecula. The source was eventually identified as a rapidly rotating neutron star. A newborn neutron star could rotate exceedingly fast, up to sereral hundred times per second. Neutron stars are small, about 10 km in diameter. Neutron star materials are highly compressed. A teaspoonful would weigh about 100 million tons. Recent studies point out that the shell of a neutron star is likely to be 10 billion times stronger than steel.¡@¡½ºÂªK±j¡@¸ê²`¤Ñ¤å·R¦nªÌ¡@¡½¹Ï¤ù¨Ó·½¡GESA, NASA
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