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From planetary.org: On July 29, 2011, Cassini captured five of Saturn’s moons in a single frame with its narrow-angle camera: Janus, Pandora, Enceladus, Rhea, and Mimas. NASA/JPL-Caltech/Space Science Institute. This is a full-color look at a view that was originally published in September 2011.
An image taken by the Hubble Space Telescope reminds us of how powerful this aging scope really is. Magnitudes sharper than the images originally sent by Pioneer as it passed by in the 1970s.
Taken on August 28, 2017. Credit: NASA/JPL-Caltech/Space Science Institute
This is from images obtained by Cassini shortly before plunging into the Saturnian atmosphere. The images were taken over 14 hours and compiled into this animation.
Image Courtesy of NASA/JPL-Caltech/SwRI
The brightest spot is a radiation signature, but all the rest are thought to be active volcanos on the Io surface. The moons are not a primary target of the Juno mission, but they do occasionally take a peek to try and monitor such phenomenon at Io. Later when the mission is extended, Juno will explore the full Jupiter system with its rings and moons. Multiple rendezvous are planned for Ganymede, Europa, and Io.
Image is not visible light, but taken with an x-ray camera.
Taken by the Curiosity rover. This is one of Mars tiny moons as seen from the ground. Impressive as it is only 14 long and you can actually see its shape from the surface. See Phobos below for reference.
“Io's shadow from @NASAJuno image PJ22_26 obtained on September 12, 2019. This is an approximately true color/contrast image. Jupiter's bluish sky is faintly visible at the limb.” — Björn Jónsson (image processor). Original tweet.