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Neutron star’s X-rays reveal ‘photon metamorphosis’（图）
中子星 X射线 光子
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2023/5/15
A “beautiful effect” predicted by quantum electrodynamics (QED) can explain the puzzling first observations of polarized X-rays emitted by a magnetar – a neutron star featuring a powerful magnetic fie...
Ancient calculator was 1,000 yrs ahead of its time
astronomi calcalculatormade X-ray tomography
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2006/12/1
November 29, 2006，An ancient astronomical calculatormade at the end of the 2nd century BC was amazingly accurate and more complex than any instrument for thenext 1,000 years, scientists said on Wednes...