Looking for a sky event this week? Check out our full Sky This Week column.  March 3: The Moon turns to blood Jupiter’s largest moon, Ganymede, transits the gas giant’s large disk overnight, beginning late on the evening of the 4th for much of the U.S.  Jupiter remains a fixture in Gemini the Twins, now visible in Continue reading "The Sky Today on Wednesday, March 4: Ganymede transits Jupiter" The post The Sky Today on Wednesday, March 4: Ganymede transits Jupiter appeared first on Astronomy Magazine .