On Sept. 24, NASA’s Astronomy Picture of the Day featured a figure that Assistant Professor of Astronomy Seth Redfield generated as part of his research on the interstellar medium, the gas and dust surrounding the Sun and other nearby stars. Each day, NASA features a different image or photograph of the universe, along with a brief explanation written by a professional astronomer. The explanation of the figure states: “The stars are not alone. In the disk of our Milky Way Galaxy about 10 percent of visible matter is in the form of gas, called the interstellar medium (ISM). The ISM is not…