These telescopes are called X-ray telescopes.
Here are some examples:
* Chandra X-ray Observatory: This NASA telescope has been observing the universe in X-rays since 1999.
* XMM-Newton: This European Space Agency telescope has been observing the universe in X-rays since 1999.
* NuSTAR: This NASA telescope is designed to observe the universe in high-energy X-rays.
How do X-ray telescopes work?
Unlike optical telescopes that use mirrors to focus light, X-ray telescopes use nested, grazing incidence mirrors. These mirrors are shaped like a series of tubes, and X-rays are reflected off the inside surface at a very shallow angle. This allows the X-rays to be focused onto a detector, which is typically a charge-coupled device (CCD).
What do X-ray telescopes tell us?
X-ray telescopes provide information about extremely hot and energetic objects in the universe, such as:
* Black holes: X-ray emissions from accretion disks around black holes provide clues about the nature of these mysterious objects.
* Neutron stars and pulsars: These extremely dense objects emit X-rays as they spin and interact with their surroundings.
* Supernova remnants: The explosions of massive stars create shock waves that heat gas to millions of degrees, causing it to emit X-rays.
* Active galactic nuclei: These are the extremely luminous cores of galaxies, powered by supermassive black holes.
In summary, X-ray telescopes are a powerful tool for studying the universe and its most energetic phenomena.
