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