They typically move in ellipses around the Sun.
Stars or asteriods
Of all the significant bodies in the solar system, comets are the ones with -- the most eccentric elliptical orbits -- the orbits most inclined to the plane of the ecliptic -- the most volatile compositions
Solar system
A solar system could simply have one planet, the most important thing is that it has to have a sun with celestial bodies that revolve around it in its gravitational field to be classified as a solar system.
Star (sun), planets, moons, dwarf planets, meteoroids, asteroids, comets. That's most of them, based on what's in our solar system.
Mars and Jupiter.
The two main bodies in terms of mass in our solar system are the Sun and Jupiter. The Sun contains over 99% of the total mass in the solar system, while Jupiter is the largest planet and contains most of the remaining mass after the Sun.
The most numerous bodies in the solar system are asteroids. There are estimated to be millions of them, with most of them located in the asteroid belt between Mars and Jupiter. They vary in size from small rocks to large bodies several hundred kilometers in diameter.
The sun has by far the most mass as any other single abject in the solar system.
Our Moon, the planet Mercury, and most of the asteroids and dwarf planets are too small to have an atmosphere.
Most of the asteroids within our solar system can be found within the Asteroid Belt. Located between the orbits of Mars and Jupiter, the Asteroid Belt consists of millions of individual asteroids of varying sizes - from a speck of dust to hundreds of kilometers in diameter. The largest object within the belt is a dwarf planet - Ceres - which has a mass of 9.47x1020kg and a diameter of 476.2km.
Yes. A lot of the other solar bodies out there have molten cores. All they need is a crack in the crust that makes a defect, and the liquid magma will be forced out of that opening, because of all of the pressure. Sometimes it isn't melted rock that makes the volcano. most of the stellar bodies in the solar system sport geysers that shoot a natural liquid high into the air.