Juno is a NASA spacecraft designed to study the planet Jupiter. Launched on August 5, 2011, it entered Jupiter's orbit on July 4, 2016. Juno's primary mission, which lasted until July 2021, consisted of 33 orbits around the gas giant. The mission was extended twice, and as of March 2022, Juno is now in its extended mission phase, which is scheduled to end in September 2025.

Juno's primary science goal is to investigate the interior structure and dynamics of Jupiter, including its water abundance and distribution, the properties of its atmosphere, and the magnetic fields generated by its rapid rotation. To achieve these goals, Juno is equipped with a suite of scientific instruments, including a magnetometer, a microwave radiometer, a visible-light imager, and a suite of spectrometers.

Some specific objectives of Juno's mission include:

Determining Jupiter's interior structure and composition

Studying Jupiter's atmosphere, including its composition, circulation patterns, and cloud structure

Investigating the generation of Jupiter's powerful magnetic field

Exploring Jupiter's polar magnetosphere and aurora

Observing Jupiter's moons, including the large moons Ganymede, Europa, and Callisto

Through its observations and measurements, Juno aims to provide a better understanding of Jupiter's formation and evolution, and its role in the broader context of the solar system.