Rocks, dust, and other space junk
The rings around planets are called planetary rings. They are made up of countless small particles, ranging in size from micrometers to meters, that orbit around the planet due to gravitational forces.
Uranus is the planet out of the Jovian planets that does not have rings.
The four planets with rings around them are Saturn, Jupiter, Uranus, and Neptune. Each of these planets has a system of rings made up of ice, rock, and dust particles that orbit around the planet.
Only the four outer planets have rings. The four inner planets (Mercury, Venus, Earth and Mars) dont have rings.
The planets Saturn, Jupiter, Neptune and Uranus have rings. There are great number of rings around some planets, such as Saturn. These rings are often grouped into ring bands or groups of rings. Saturn has about 14 bands, Neptune has 5 and Jupiter has 4 and I give up on Uranus. If you want to figure all this out, scroll to the bottom of the link below and you will find links to a discussion of each planet's rings
The planets that don't have rings or moons are Mercury and Venus. All other planets have either a moon, rings or both.
mostly ice rock and dust
Stars do not have rings. Planets have rings.
The four gas giants, Jupiter, Saturn, Uranus and Neptune, have rings. The rings are made up of dust paricles and ice.
The outer planets (Jupiter, Saturn, Uranus, Neptune) have rings. Jupiter has four main faint rings, Saturn has the most prominent ring system with several distinct rings, Uranus has 13 known rings, and Neptune has five rings.
Jovian planets have rings because their strong gravitational forces can capture and maintain orbiting particles and debris that form the rings. This is due to their larger size and mass compared to terrestrial planets. The rings around Jovian planets are made up of rock, ice, and dust particles that orbit around the planet in thin bands.
Planets do not make up the Earth's crust.