NICER (Neutron star Interior Composition Explorer)

NICER (Neutron star Interior Composition Explorer) is a scientific instrument attached to the International Space Station that studies neutron stars—ultra-dense remnants of massive stars. By measuring X-ray emissions from these stars with high precision, NICER helps scientists understand their internal structure, composition, and the physics under extreme conditions. Its observations provide insights into the behavior of matter at nuclear densities, aiding our knowledge of fundamental physics and the life cycles of stars.