Sky & Telescope September 2020 Magazine

In the September 2020 issue of Sky & Telescope, we finish off our three-part series on volcanism with a look at the end of the life cycle of a volcanic world. We also take a look at the pros and cons of image stacking when processing your images. The Andromeda Galaxy is a popular astrophotography target, and this month, we guide readers through several of its subtle wonders. Such little marvels are nowhere near as hard to spot as the so-far elusive exomoon. Read all about the scientists who are painstakingly hunting for moons outside of our solar system. Finally, after a decade of careful observation and comparison, a team of astronomical detectives has estimated the date and time that Johannes Vermeer observed the scene he painted in View of Delft, using his carefully painted patterns of light and shadow as clues.