Hi all! My name is Nova and I have recently started a research project on the life cycle of planets, stars, galaxies, etc. I posted this question on reddit, but no one seemed particularly interested. Someone suggested I consult the ultimate physics community on the web, Physics Forums, so here I am. These two papers (one published in February, the other, a few days ago) seem to be contradicting each other. One says they will die from "strangulation" because their source of fuel eventually runs out (they measured the average change of metallicity in thousands of galaxies to determine this). The other says they die because their source of fuel is actually stripped away. Am I not understanding something? Can they both be right? My hunch says both *can* happen, but the latter is much less likely and more research needs to be done. A bit about myself. I am an astronomy major and a novice shroomer (mushroom farmer, non-psychadelic). Thanks so much Nova 1.) May: http://phys.org/news/2015-05-galactic-death-strangulation.html 2.) February: http://phys.org/news/2015-02-fast-die-young-galaxies-gas.html#nRlv P.S. Let me know if you need me to link to the research papers themselves.