Two new images of Jupiter from NASA's Juno spacecraft are spectacular, as usual. Its Great Red Spot is down at the lower left. If you look carefully, you'll see a tiny dot in one spot that isn't in the other. That's Jupiter's tiny moon, Amalthea, a potato-like object that measures just 84 kilometers across. It's the reddest object in the Solar System and releases more heat than it receives from the Sun, probably because of its interaction with Jupiter's magnetic field.

https://www.nasa.gov/image-article/nasas-juno-mission-spots-jupiters-tiny-moon-amalthea/