Portal:Radiation astronomy/X-ray astronomy article/9

An X-ray telescope (XRT) is a telescope that is designed to observe remote objects in the X-ray spectrum. In order to get above the Earth's atmosphere, which is opaque to X-rays, XRTs must be mounted on high altitude rockets or artificial satellites. The telescopes have varying directionality or imaging ability based on glancing angle reflection rather than refraction or large deviation reflection. The most common methods of design are grazing incidence mirrors and coded apertures. The limitations of X-ray optics result in much narrower fields of view than visible or UV telescopes. A recent innovation in telescope design uses normal incidence reflective multilayer optics.