Looking for a sky event this week? Check out our full Sky This Week column.  August 17: Mars at Gemini’s feet Wait until after about 10 P.M. tonight to begin your deep-sky observing and the Moon won’t be a bother. An excellent target is NGC 6939, an open cluster in Cepheus the King. This cluster is quite Continue reading "The Sky Today on Tuesday, August 18: Stars and sparklers" The post The Sky Today on Tuesday, August 18: Stars and sparklers appeared first on Astronomy Magazine .