Our Solar System’s Milky-Way Orbit 19 –Extinction by Dark-Matter Apocalypse?

    At present, our Solar System is in its twentieth orbit of the Milky Way near the inner edge of a spiral feature known as the Orion Arm or, less poetically, the Local Arm. The ghostly arms are not permanent features of a disc galaxy like the Milky Way. Rather, they are concentrations of … Continue reading Our Solar System’s Milky-Way Orbit 19 –Extinction by Dark-Matter Apocalypse?