Comets are balls of ice and dust in orbit around the Sun. The orbits of comets are different from those of planets - they are elliptical. A comet's orbit takes it very close to the Sun and then far away again.
Oort cloud comets
Earth is much more massive than asteroids and comets, and thefore has much stronger gravity, which pulls it into a spherical shape. Most asteroids and comets do not have strong enough gravity to do this.
Both asteroids and moons can be rocky. An asteroid orbits the Sun while a moon orbits a planet. Mars has two moons (Deimos and Phobos) that are most likely former asteroids.
the gravity from Jupiter is so strong that it pulls most of the comets and asteroids to it instead of the inner planets
As an elliptical orbit is any orbit that isn't perfectly circular, everything has an elliptical orbit. The planets Mercury and Pluto have the most elliptical orbits of the planets, and are easily seen to be oval shaped. Comets also have highly elliptical orbits.
An asteroid, because the orbits of the asteroids are nearer to the earth than the comets.
Comets
In terms of "cool" (as in "awesome"), this question is entirely opinion. I think most people would consider comets more awesome than asteroids because comets are sometimes visible from earth. In terms of temperature, comets are made mostly of rock and ice. However, when their orbits are close to the sun, they can heat up and burn off some of the ice, forming the comet's tail. This means that a comet's temperature can vary depending on where it is in its orbit. On the other hand, asteroids in the asteroid belt have fairly regular orbits, which means that their temperature is fairly constant: cold.
The main difference between asteroids and comets is what they are made of. Asteroids are made of metals and rocky material, while comets are made up of ice, dust and some rocky material. Both asteroids and comets were formed early in the history of the solar system, about 4.5 billion years ago. Asteroids formed much closer to the Sun, where it was too warm for ices to remain solid. Comets formed farther from the Sun where ices would not melt. Comets which approach the Sun lose material with each orbit because some of their ice melts and vaporizes to form a tail.An asteroid is a small, inactive body, made up of rock, carbon or metal, that orbits the Sun.A comet is also a small, but sometimes active object, made of dirt and ice. Comets are able to be seen by their characteristic tails as they become affected by the heat of the Sun. The tail of a comet is pushed away from the Sun. It does not necessarily trail behind it.Comets follow highly elliptical orbits, approaching the inner solar system and then retreating to a considerable distance from the Sun. If they stayed close in to the Sun, all the ice would vaporize, and they would cease to be comets. Most asteroids tend to have more nearly circular orbits, although some develop more elongated orbits as a result of gravitational interactions with the planets or other asteroids.Asteroids have diameters anywhere from a few meters to a few hundred kilometers. Only about 200 asteroids have diameters exceeding 100 kilometers. Most rotate on their axes every 5 to 20 hours. Most asteroids in the solar system are located in the 'asteroid belt', where they orbit the sun in the space between the orbits of Mars and Jupiter. Some smaller asteroids may orbit larger asteroids as satellites. Asteroids are different from planets and moons mainly because of their much smaller size, and irregular shapes.
Mars and Jupiter
Oort cloud comets
No. Most asteroids are in the asteroid belt between the orbits of Mars and Jupiter.
Both asteroids and moons can be rocky. An asteroid orbits the Sun while a moon orbits a planet. Mars has two moons (Deimos and Phobos) that are most likely former asteroids.
Most "asteroids" are in orbit around the Sun, unless disturbed by gravity or collisions. Comets may orbit the Sun regularly, or be drawn in from the outer solar system and pass by the Sun on their way back out (hyperbolic comets).
Most asteroids are between the orbits of Mars and Jupiter.
Most asteroids are between the orbits of Mars and Jupiter.
The main difference between asteroids and comets is what they are made of. Asteroids are made of metals and rocky material, while comets are made up of ice, dust and some rocky material. Both asteroids and comets were formed early in the history of the solar system, about 4.5 billion years ago. Asteroids formed much closer to the Sun, where it was too warm for ices to remain solid. Comets formed farther from the Sun where ices would not melt. Comets which approach the Sun lose material with each orbit because some of their ice melts and vaporizes to form a tail.An asteroid is a small, inactive body, made up of rock, carbon or metal, that orbits the Sun.A comet is also a small, but sometimes active object, made of dirt and ice. Comets are able to be seen by their characteristic tails as they become affected by the heat of the Sun. The tail of a comet is pushed away from the Sun. It does not necessarily trail behind it.Comets follow highly elliptical orbits, approaching the inner solar system and then retreating to a considerable distance from the Sun. If they stayed close in to the Sun, all the ice would vaporize, and they would cease to be comets. Most asteroids tend to have more nearly circular orbits, although some develop more elongated orbits as a result of gravitational interactions with the planets or other asteroids.Asteroids have diameters anywhere from a few meters to a few hundred kilometers. Only about 200 asteroids have diameters exceeding 100 kilometers. Most rotate on their axes every 5 to 20 hours. Most asteroids in the solar system are located in the 'asteroid belt', where they orbit the sun in the space between the orbits of Mars and Jupiter. Some smaller asteroids may orbit larger asteroids as satellites. Asteroids are different from planets and moons mainly because of their much smaller size, and irregular shapes.