V838 Mon

SOFIA FORCAST measurements (orange) of the V838 Mon spectrum, and the best-fit composite model of SOFIA data with a silicate-to-alumina ratio of 50:50 (yellow), overlaid atop an image of V838 Mon

SOFIA FORCAST measurements (orange) of the V838 Mon spectrum, and the best-fit composite model of SOFIA data with a silicate-to-alumina ratio of 50:50 (yellow), overlaid atop an image of V838 Mon obtained by the Hubble Space Telescope, which shows the light echo illuminating circumstellar material. Credit: V838 Mon: ESA/Hubble & NASA; Spectra: Woodward et al.