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Photo - A new study has found that a share of particles that has gone missing is most likely located at the distant bounds of galaxy haloes. The study found some of these particles of baryonic matter located about 6 million light-years from their galactic centers. This color-rendered image shows the halo of the Andromeda galaxy, which is the Milky Way’s largest galactic neighbor. (Credit: NASA) A collage of a telescope over a orange, star-filled sky Screenshot - A spiral galaxy, viewed with the Sky Viewer tool. (Credit: DESI Legacy Imaging Surveys) Image - This image, produced by the Millennium-II Simulation, shows the evolution of dark matter in the universe. (Credit: Milennium-II Simulation) Photo - Kitt Peak National Observatory at dusk. DESI, the Dark Energy Spectroscopic Instrument, is housed within the Mayall Telescope dome (right). (Credit: Marilyn Sargent/Berkeley Lab)