The observations of our galaxy throughout history have told us that our Milky Way is roughly 100,000 light years across.  A number confirmed time and time again by scientists with better and better instruments.  But recently a team from the Rensselaer Polytechnic Institute in New York, USA, published a paper challenged that idea, saying the galaxy is much bigger, up to 150,000 light years in diameter. They used the Sloan Digital Sky Survey’s (SDSS) data to look at the distribution of stars outward from the centre of the galaxy, in reference the the galactic plane.  They discovered that the stellar distributions oscillated...