Breadcrumb Home Juno makes Earth fly-by before 3-year trip to Jupiter Wednesday, October 9, 2013 UPI http://www.redorbit.com/news/space/1112969448/juno-makes-earth-fly-by-before-tr… On Wednesday, NASA’s Juno mission will be passing within about 350 miles of Earth’s surface, which will be the closest it’s been to our planet since leaving it in August 2011.