Yes. The density of the Galilean moons decreases with increasing distance from the planet. This decrease in density is likely due to the higher ice-to-rock ratio in the farther moons.
Jupiter has 63 confirmed moons, and 8 regular satellites (split into Main Group and Inner Satellites). The four largest (Main Group or Galilean Moons) are terms of relative mass are Ganymede, Callisto, Io and Europa. The other four moons (Inner Satellites or Amalthea Group) are called Metis, Adrastea, Amalthea and Thebe. For further information enter 'moons of Jupiter' in WIKI.
From what I have read, the closer one of the Galilean Moons is to Jupiter, the hotter is their interior (as a result of tidal heating due to Jupiter's gravity). The outer ones have more of an ice core. The inner ones less. When it melts, the water makes it way to the surface being less dense than the surrounding rock, and evaporates off, leaving the heavier rock forming most of the crust. Therefore the more dense the inner Galilean Moons.
No, outer planets have more rings and satellites compared to inner planets. For example, Jupiter has the most known satellites with over 80 moons, while Saturn is known for its extensive ring system. Inner planets like Earth and Mars have few to no natural satellites.
Io, Europa, Ganymede, and Callisto are the individual moons. If you're looking for a term that covers all of them, they're often referred to as the "Galilean satellites" since they're the ones Galileo saw. They're readily visible in even an extremely modest telescope.
by density change
The inner core has the most or highest amount of density (iron/nickel).
Inner planets
As far as is known: -- Neither Mercury nor Venus has any natural satellites. -- Earth has one -- Mars has two
i dont knoww
The Earth has the greatest average density, of all the planets.
15g/cm3
The inner core was discovered in 1936 by Inge Lehmann and is generally believed to be composed primarily of iron and some nickel. Its estimated density is between 12.6 to 13.0 grams to cubic centimeters.