A band of radio frequencies extending from 5200 to 10 900 MHz
ESA's X-ray space observatory mission, with its X-ray Multi-Module design using three telescopes each with 58 nested X-ray mirrors. Named also in honour of Sir Isaac Newton. See http://sci.esa.int/xmm-newton/
Electromagnetic radiation with wavelengths between those of ultraviolet and gamma rays, approximately 0.01-10 nm. At these short wavelengths, it is more common to talk in terms of photon energies. These energies range from 0.1-100 keV.