Some galaxies, like some cities, are large and sprawling. Giant spiral galaxy NGC 772—at 200,000 light-years across and twice the size of our own galaxy—can be compared with the sprawling metropolis of Houston, which has a total area of more than 650 square miles (1,680 square kilometers). #GalaxyCity #EarthAndSpace Credit: NASA Earth/NASA/ESA. | Space Telescope Science Institute