·Introduction ·Detectors A brief history of X-ray astronomy ·X-ray targets ·Imaging technique ·X-ray observatories ·Future Cosmic X-ray Background(CXB) 6/4/2022• Introduction • Detectors • A brief history of X-ray astronomy • X-ray targets • Imaging technique • X-ray observatories • Future • Cosmic X-ray Background (CXB) 6/4/2022