Comets, though they may contain other elements.
Some comets are made of ice and dust.
Kuiper belt.
Those astronomical objects are called comets.
That description sounds like a comet. Comets are celestial objects made up of ice, rocks, and dust that orbit the Sun. When they get close to the Sun, the heat causes ice to vaporize and creates a bright glowing coma and tail.
Most of interstellar matter is composed of gas (mainly hydrogen and helium) and dust. The gas is primarily in the form of atomic and molecular hydrogen, while the dust consists of tiny solid particles made up of elements like carbon, silicates, and ice.
Comets are made mainly from ice, with a slight mixture of small rocks and dust.
Since interstellar clouds are most often overdensities in the interstellar medium, they have overwhelmingly similar chemical compositions - most of them (about 90%) being hydrogen, although this may be molecular, or ionized (plasma), with most of the remainder being helium. Heavier elements and compounds have been discovered spectroscopically in interstellar clouds, including more recently some unexpected light organic molecules.
Saturn's rings are made of dust, ice, and rock.
Ice & dust.
Comets are made mainly from ice, with a slight mixture of small rocks and dust.
Almost true, that describes more of an asteriod, a comet is like a dirty snowball made of ice and gas.
ice crystals and dust