NICER observatory

NICER (Neutron-star Interior Composition Explorer) is a NASA space telescope mounted on the International Space Station. It specializes in studying X-ray emissions from neutron stars—ultra-dense remnants of exploded stars. By analyzing these high-energy signals, NICER helps scientists understand the internal structure of neutron stars, their composition, and extreme physics under intense gravity and magnetic fields. Its precise measurements improve knowledge about matter at nuclear densities, contributing to our understanding of fundamental physics and the life cycles of stars.