The Cosmic X-ray Background (CXB) is a pervasive and faint glow of X-ray radiation that fills the universe. It was first discovered in the 1960s and has since been a subject of intense study in the field of astrophysics. The CXB consists of X-ray photons emitted by a multitude of discrete and unresolved sources scattered throughout the universe. While some of these sources are readily identified as active galactic nuclei, stellar-mass black holes, or X-ray binary systems, a significant portion of the CXB remains unattributed. The CXB is essential for understanding the high-energy universe, revealing the presence of celestial objects and energetic processes that would otherwise be concealed by optical or radio observations. Read more bout binary black hole.
