This was one of GGWash’s most popular articles in 2020. We’re sharing some of our hits again over the holiday season. On July 15, the crew of the International Space Station posted a nighttime photo of our region from space on Twitter, likening Washington, DC and Baltimore to “two galaxies swirling near each other.” This photo gives us the opportunity to make a number of observations about the region. DC and Baltimore City are different colors at night The first thing that stands out when one looks at the ISS crew’s photo nighttime lighting in our region is that the Washington region looks orange while the Baltimore region looks white. If they actually