A biennial event organized by ISRO for researchers working in the fields of atmospheric, space and planetary sciences, astronomy and astrophysics, and the exploration of solar system bodies. The first NSSS was held in 1978 at Andhra University, Visakhapatnam. The 23rd National Space Science Symposium will be held at Umiam, Shillong and hosted by the North Eastern Space Applications Centre (NESAC). The NSSS 2026 will feature six parallel scientific sessions on diverse themes in space science and technology, including an exclusive student session aimed at fostering young scientific minds. The event will also include public lectures, plenary and interdisciplinary sessions, invited talks delivered by leading experts and professionals from the field and exhibition by industry & government.