Juno

Juno

Mapping Io’s Hidden Heat With NASA’s Juno

Description This graphic illustrates the areas of Jupiter’s moon Io sampled by the Microwave Radiometer (MWR) instrument aboard NASA’s Juno spacecraft during two close flybys. The black overlapping lines show the instrument’s footprints during Perijove 57 on Dec. 30, 2023, when the spacecraft primarily mapped the northern hemisphere.

Posted July 22, 2026

Juno

Photojournal

NASA’s Juno Peers Beneath Io’s Surface

Description This map represents data captured by the Microwave Radiometer (MWR) aboard NASA’s Juno spacecraft, indicating heat rising from just beneath the surface of Jupiter’s moon Io.

Posted July 22, 2026

Juno

Jet Propulsion Laboratory

Jupiter

Planetary Science

NASA’s Juno Takes Temperature of Jupiter’s Fiery Moon Io

Lee esta historia en español aquí. NASA’s Juno mission has provided the first measurements of the temperature below the surface of Jupiter’s moon Io, revealing significant heating within the shallow subsurface of the most volcanically active world in the solar system.

Posted July 22, 2026

Juno

Europa

Jet Propulsion Laboratory

NASA’s Juno Measures Thickness of Europa’s Ice Shell

Results from the solar-powered spacecraft provide a new measurement of the thickness of the ice shell encasing the Jovian moon’s ocean. Data from NASA’s Juno mission has provided new insights into the thickness and subsurface structure of the icy shell encasing Jupiter’s moon Europa.

Posted January 27, 2026

Juno

Jupiter’s Volcanic Moon Io

During its close flyby of Jupiter’s moon Io on December 30, 2023, NASA’s Juno spacecraft captured some of the most detailed imagery ever of Io’s volcanic surface. In this image, taken by the JunoCam instrument from about 930 miles (1,500 kilometers) above the moon, Io’s night side [left lobe] is illuminated by “Jupitershine,” which is […]

Posted September 30, 2025

Juno

Jupiter

Jupiter’s Turbulent Atmosphere

JunoCam, the visible light imager aboard NASA’s Juno spacecraft, captured this view of Jupiter’s northern high latitudes during the spacecraft’s 69th flyby of the giant planet on Jan. 28, 2025.

Posted May 12, 2025

Juno

Jet Propulsion Laboratory

Jupiter

Jupiter Moons

NASA’s Juno Mission Gets Under Jupiter’s and Io’s Surface

New data from the agency’s Jovian orbiter sheds light on the fierce winds and cyclones of the gas giant’s northern reaches and volcanic action on its fiery moon. NASA’s Juno mission has gathered new findings after peering below Jupiter’s cloud-covered atmosphere and the surface of its fiery moon, Io. Not only has the data helped […]

Posted April 29, 2025

Juno

Jet Propulsion Laboratory

Jupiter

Jupiter Moons

The Solar System

NASA Juno Mission Spots Most Powerful Volcanic Activity on Io to Date

Even by the standards of Io, the most volcanic celestial body in the solar system, recent events observed on the Jovian moon are extreme. Scientists with NASA’s Juno mission have discovered a volcanic hot spot in the southern hemisphere of Jupiter’s moon Io. The hot spot is not only larger than Earth’s Lake Superior, but […]

Posted January 28, 2025

Juno

Jet Propulsion Laboratory

NASA’s Juno Mission Uncovers Heart of Jovian Moon’s Volcanic Rage

A new study points to why, and how, Io became the most volcanic body in the solar system. Scientists with NASA’s Juno mission to Jupiter have discovered that the volcanoes on Jupiter’s moon Io are each likely powered by their own chamber of roiling hot magma rather than an ocean of magma. The finding solves […]

Posted December 12, 2024

Juno

Europa

Jet Propulsion Laboratory

Jupiter

Jupiter Moons

The Solar System

Danish Instrument Helps NASA’s Juno Spacecraft See Radiation

Using cameras designed for navigation, scientists count ‘fireflies’ to determine the amount of radiation the spacecraft receives during each orbit of Jupiter. Scientists with NASA’s Juno mission have developed the first complete 3D radiation map of the Jupiter system.

Posted August 20, 2024