Turns out the Milky Way is 50% bigger than previous thought due to the "ripple" effect when dwarf galaxies goes through the center of the galaxy, just like how you drop a pebble in a pond. The galaxy is not in a "flat" disk but more of a wave disk. More places to explore! xD
http://thespacereporter.com/2015/03...scover-50000-bonus-light-years-in-our-galaxy/
http://thespacereporter.com/2015/03...scover-50000-bonus-light-years-in-our-galaxy/