It seemed perfect that this was the Image of the Day from June 24, 2018 on the NASA Earth Observatory website.
This is a daylight true color image and a thermal image taken 3 weeks after the eruption of Volcan de Fuego in Guatamala. Images were taken using Landsat 8. Scientists are studying this imagery for a number of reasons, including ongoing learning about the behavior of volcanoes and lahars, and the potential for disaster response during night time events. However, as the article points out, the nighttime response would be limited to a satellite being in the correct position with the correct weather conditions, so is not a system that could be relied on as a primary source of information.
Link the the article:
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