Looking for a sky event this week? Check out our full Sky This Week column.  February 24: Chase the Coma galaxy cluster Already high in the east as darkness falls, Jupiter still dominates the constellation Gemini. The gas giant’s large moon Ganymede transits the disk this evening, with its shadow following a few hours later. You’ll be Continue reading "The Sky Today on Wednesday, February 25: Ganymede tracks across Jupiter" The post The Sky Today on Wednesday, February 25: Ganymede tracks across Jupiter appeared first on Astronomy Magazine .