The Astrophysics of Neutron Stars With E(xtra)(nergetic)(xtreme)(xotic) Related Stuff Group is a research group of faculty, postdoctoral, graduate, and undergraduate researchers who study neutron stars from both theoretical and observational perspectives. Group members also work on projects related to gamma-ray, x-ray, ultraviolet, optical, and radio astronomy, magnetohydrodynamics, plasma physics, nuclear physics, the fundamental nature of dark matter , and general relativity. We are based primarily out of the Instituto de Astrofísica at Pontificia Universidad Católica de Chile, located at the university's San Joaquín Campus in Santiago, Chile.

Group members are affiliated with a number of international collaborations including: