LIVING WITHIN THE VAST MILKY WAY GALAXY.

LIVING WITHIN THE VAST MILKY WAY GALAXY.

OUR GALAXY IS A TYPICAL BARRED SPIRAL, MUCH LIKE BILLIONS OF OTHER GALAXIES IN OUR UNIVERSE.   We are viewing it from the outer edge of one of four spiral arms. (actually on a spur of a spiral arm  called the Orion arm.) It is about 100,000 light years across. It...