The Nuclear Spectroscopic Telescope Array (NuSTAR) is a space-based X-ray telescope launched by NASA in June 2012. It is the first telescope capable of focusing high energy X-rays, similar to how visible light telescopes focus light, which allows it to observe and photograph objects in considerably higher detail than was previously possible with non-focusing telescopes. NuSTAR primarily investigates black holes, supernova remnants, active galactic nuclei, and other phenomena in the high-energy X-ray range (3-79 keV). It provides vital data that help astronomers understand the physics behind these high-energy events and objects, contributing significantly to our knowledge of the universe’s dynamic processes. The mission, which has significantly exceeded its initial planned duration, continues to contribute valuable observations of the extreme universe, aiding in various collaborative studies and cross-mission research with other telescopes in space and on Earth.