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The space agency's distant Juno probe, orbiting Jupiter hundreds of millions of miles away, has been swooping progressively closer to the Jovian moon Io — the most volcanically active world in our solar system. Juno recently made its 55th journey around Jupiter, zipping just some 7,270 miles (11,700 kilometers) from Io's surface, which in space-terms means almost skimming it (7,270 miles is over three times closer than some major U.S weather satellites).
NASA's Juno spacecraft captured these images on Oct. 15 and beamed them back to Earth the next day. These views are processed (removing noise and distortion, etc.) by both professional and amateur image processors, some of whom work for NASA or related space research programs.
SEE ALSO: NASA found a surprise when opening its asteroid canisterThe following images are some of the clearest views of Io ever taken: You can see dark splotches (indicating lava flows), topography like volcanos rising from the moon's surface, and what could be a volcanic plume blowing into space.
And the spacecraft will swoop even closer, making its closest pass by Io in December and again in January 2024.
"We're marching closer and closer," Scott Bolton, the Juno mission's principal investigator, told Mashable earlier this year.
Jupiter's moon Io, seen from a close pass on Oct. 15, 2023. Credit: NASA / JPL-Caltech / SwRI / MSSS / Kevin M. Gill / CC BY 3.0 
Io, on left, and a partial view of the gas giant Jupiter, on right. Credit: NASA / JPL-Caltech / SwRI / MSSS / Kevin M. Gill / CC BY 3.0 
The bottom of this Io image shows what could be a volcanic plume. Credit: NASA / JPL-Caltech / SwRI / MSSS / Brian Swift / CC BY 3.0 This Tweet is currently unavailable. It might be loading or has been removed.
Io is blanketed in erupting volcanoes because it's relentlessly locked in a tug-of-war between nearby objects. "Not only is the biggest planet in the solar system forever pulling at it gravitationally, but so are Io’s Galilean siblings — Europa and the biggest moon in the solar system, Ganymede," NASA explained in a statement. "The result is that Io is continuously stretched and squeezed, actions linked to the creation of the lava seen erupting from its many volcanoes."
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Io, while fascinating, certainly isn't a place that is suitable for life to exist. But other nearby moons could be.
"We're marching closer and closer."
In the coming years, we'll learn considerably more about the moon Europa, a world planetary scientists say harbors a salty sea beneath its thick, icy shell. "Europa may be the most promising place in our solar system to find present-day environments suitable for some form of life beyond Earth," NASA explains. In 2024, NASA will launch the much-anticipated Europa Clipper spacecraft to Jupiter, where the probe will repeatedly sweep close to the moon.
"NASA's Europa Clipper will conduct detailed reconnaissance of Jupiter's moon Europa and investigate whether the icy moon could harbor conditions suitable for life," the space agency said.