We know that the Milky Way is a large, multi-armed spiral galaxy with newborn stars lining its spiral arms. But how much like this famous night sky wonder, the Pinwheel Galaxy (Messier 101), is our Milky Way really? (Credit: NASA, ESA, K. Kuntz (JHU), F. Bresolin (University of Hawaii), J. Trauger (Jet Propulsion Lab), J. Mould (NOAO), Y.-H. Chu (University of Illinois, Urbana), and STScI)
Our galactic home in the cosmos — the Milky Way — is only one of many trillion galaxies within in the observable Universe. Do we have a twin?
Our galactic home in the cosmos — the Milky Way — is merely one among the observable Universe’s two trillion.
