Secrets of Ancient Stars of the Milky Way’s Halo

NASA Milky Way Halo


“Finding old stars could also lead to the discovery of new planets. Maybe we can find some ancient civilizations around these old stars,” suggested astrophysicist, Wei-Chun Jao, research scientist at Georgia State University about the oldest stars developed in the early stage of the Milky Way’s formation, making them about eight to twelve billion years old. They’re found in the halo, a roughly spherical component of the galaxy that formed first, in which old stars move in orbits that are highly elongated and tilted, hinting at their age through their motion, rotation rate, and chemistry.