====== X-ray telescopes ======

^ Telescope Name ^ Location ^ Frequency Range ^ Number of Antennas ^ Key Scientific Objectives ^ Notable Features ^
| **Chandra X-ray Observatory** | Space (NASA mission) | 0.1–10 keV | Space telescope | Black holes, neutron stars, galaxy clusters, supernova remnants | High-resolution imaging, sensitive detectors; provides detailed X-ray spectra and images |
| **XMM-Newton (X-ray Multi-Mirror Mission)** | Space (ESA mission) | 0.1–15 keV | Space telescope | Galaxy clusters, active galactic nuclei, stellar coronae | Large collecting area, high sensitivity; multi-wavelength capabilities with optical and UV detectors |
| **NuSTAR (Nuclear Spectroscopic Telescope Array)** | Space (NASA mission) | 3–79 keV | Space telescope | Black holes, neutron stars, supernova remnants, galaxy evolution | First focusing hard X-ray telescope; high sensitivity at higher X-ray energies |
| **Swift XRT (X-ray Telescope)** | Space (NASA mission) | 0.3–10 keV | Space telescope | Gamma-ray bursts, supernovae, transient events | Rapid response to transients; supports multi-wavelength observations with UV and optical instruments |
| **NICER (Neutron Star Interior Composition Explorer)** | International Space Station (ISS) | 0.2–12 keV | Space telescope on ISS | Neutron star structure, black holes, pulsars | Precision timing and spectroscopy; focused on neutron star interiors |
| **RXTE (Rossi X-ray Timing Explorer)** | Space (NASA mission, decommissioned in 2012) | 2–250 keV | Space telescope | X-ray binaries, pulsars, black holes | High time-resolution for studying variability in X-ray sources |
| **Suzaku (formerly ASTRO-EII)** | Space (JAXA/NASA mission, decommissioned in 2015) | 0.3–600 keV | Space telescope | Black holes, galaxy clusters, supernova remnants | Broad energy range; simultaneous X-ray imaging and spectroscopy |
| **ROSAT (Röntgensatellit)** | Space (Germany, NASA, UK mission, decommissioned in 1999) | 0.1–2.4 keV | Space telescope | Supernova remnants, X-ray binaries, active galactic nuclei | First X-ray all-sky survey; contributed extensively to X-ray source catalogs |
| **Einstein Observatory** | Space (NASA mission, 1978–1981) | 0.2–20 keV | Space telescope | Supernova remnants, black holes, galaxy clusters | First fully imaging X-ray telescope; provided early detailed images of X-ray sources |
| **eROSITA (extended ROentgen Survey with an Imaging Telescope Array)** | Space (on Spektr-RG, Russian mission) | 0.2–10 keV | Space telescope | Galaxy clusters, cosmic structure, AGNs | All-sky X-ray survey with high sensitivity; focuses on large-scale structure of the Universe |