In brief : In a spin

 作者:宇文大     |      日期:2019-02-26 04:16:00
ASTRONOMERS have spotted a young pulsar that rotates 62 times each second—more than twice the previous record. Pulsars are dense neutron stars that can have as much mass as the Sun packed into a sphere only 10 kilometres in diameter. They form in supernova explosions, when the core of a star collapses. Theory has it that magnetic fields inside supernovae stop newborn pulsars spinning faster than 60 times per second. But now NASA’s Rossi X-ray Timing Explorer has found a pulsar spinning at 62 times per second. Old pulsars can spin far faster if matter from stars has continually fallen onto them. But the new pulsar is thought to be only 4000 years old. A team led by Frank Marshall of NASA’s Goddard Space Flight Center in Greenbelt, Maryland, calculates that the new pulsar originally rotated 150 times a second,