X-ray telescopes are one of the most important tools for studying the Universe. Such devices have already allowed
X-ray telescopes have a number of disadvantages -X-rays do not pass through the atmosphere of the Earth, so such devices can only work in space. Other issues concern resolution and focal length.
As X-rays pass throughsubstance, they can not be reflected or refracted, like visible light or radio waves, so they are difficult to focus. Thus, instead of lenses or reflectors, X-ray telescopes use a set of cylindrical mirrors that focus X-rays, causing them to bend at a very small angle. This is a practical solution, but it does not allow to achieve high resolution and requires a very large focal length.
Plastic lenses that developResearchers allow bending X-rays at a greater angle than conventional mirrors, which sharply reduces the focal length of the telescope to 50 cm - for comparison, this value is 10 m for the Chandra telescope
Earlier, the Russian ground-space observatoryRadioastron has found evidence that in the center of the galaxy OJ287 there are a couple of supermassive black holes that rotate at a short distance from each other.