What are the orbits of comets?

Answer 1

A comet's tail gets longer when it is close to the Sun. Heat from the Sun melts (actually sublimates) the ices that a comet is mostly made of. The comet's tail is made of material from the comet; gas from the ices and dust that is mixed in with the ice.
A comet has two tails. The white one is made of dust. The blue one is ionized gas. Both point roughly away from the Sun. The solar wind and radiation pressure of light from the Sun "blow" them outward.
There are two major factors that describe a comet's orbit: the size of the orbit (technically, its "semi-major axis") and the eccentricity. The size is like the radius of a circle. The eccentricity is tells how "oval-shaped" the orbit is. A small eccentricty means the orbit is roundish; a circle has an eccentricity of zero. A large eccentricity (close to one, such as 0.8 or 0.9) means the orbit is a very long oval. Halley's Comet has a high eccenticity.
If a comet has an orbit with a high eccenticity, it moves much faster when it is near the Sun than when it is far from the Sun.
If a comet has a large orbit, it takes a long time to go around the Sun. Some comets are "short-period" comets that take five or ten years to complete an orbit. Some comets are "long-period" comets that take decades, centuries, or millenia to orbit the Sun. Long-period comets originally came from the Kuiper Belt or the Oort Cloud.

Answer 2

Short period comets have highly elliptical orbits. Long period comets have parabolic orbits. There is no sharp dividing line between short and long period, but I think the orbit has to take at least several hundred years to go once around to be considered long period.

Answer 3

Each one has a different shape and size but all the ones we know about orbit our sun...

Answer 4

Ellipical

Answer 5

What do you mean by this? It's not a particularly precise question.