NASA has released new images of Jupiter as the Juno spacecraft makes its way toward the giant planet for an expected July 4th arrival On June 11, the robotic explorer began sending and receiving data around the clock to and from Earth as it prepares for the completion of its journey, NASA said on its website Juno is due to spend a year in an unprecedented polar orbit around Jupiter measuring the planet's water content, mapping its magnetic fields and searching for signs of a solid core