New results from a premier sky survey by NASA's Swift satellite at hard (energetic) X-ray energies now solidly show a strong association of AGN with merging galaxies, though.
不过现在NASA的雨燕卫星在硬（高能）X射线的巡天新成果可靠地显示活动星系核与星系合并的紧密联系。
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Franklin's achievement was to discover that previous X-ray photos of DNA were hard to interpret because DNA crystallizes in two forms, known as a and b, depending on their water content.
The German Aerospace Centre reckons RayWOx will be good at removing certain pollutants that are particularly hard to get rid of at the moment, notably antibiotics, X-ray contrast media and hormones.