In the Interstellar Danger Zone --"The Last Time Our Sun Was In This Exact Spot In Its 226-Million-Year Milky-Way Orbit, Dinosaurs Ruled Earth"

In 1999 astronomers focusing on a star at the center of the Milky Way, measured precisely how long it takes the sun to complete one orbit (a galactic year) of our home galaxy: 226 million years. The last time the...