It’s no secret that the Milky Way is big, but new research shows that it may be much bigger than we ever imagined. The research, described May 7 in the journal “Astronomy & Astrophysics,” indicates that our spiral galaxy’s vast rotating disk of stars spans at least 170,000 light-years, and possibly up to 200,000 light-years. It’s hard to fathom just how far that is. If you could rid