Space telescope observations reveal clues to a critical period.
Andrew Masterson, Cosmos Magazine 13 May 2019
(c) NASA/JPL-Caltech
21st Century Education
(c) NASA/JPL-Caltech
(c) European Southern Observatory 2 May 2019
(c) Event Horizon Telescope collaboration, et al; 10 Apr 2019
Barred Spiral Milky Way. (c) Illustration Credit: R. Hurt (SSC), JPL-Caltech, NASA
Chasing dark matter with the oldest stars in the Milky Way,
Phys.org, 24 Jan 2018