All shapes. Since it is a solid it would be called an "ovoid" rather than an ellipse, and they are more likely to be quite irregular and jagged rather than smooth.
Meteroid orbits are random. Much like a comet.
The orbit of Mercury has the highest eccentricity of all the Solar System planets
Plato; Elliptical
in space
Their speeds vary.
A meteroid is a natural object in space. A meteroid can enter the atmosphere and become a meteor. If its remains strike the ground and survive, it is a meteorite.
dust & rock
Ambient temperature.
depends how big it is...
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.
The best elliptical machine exercise equipment on the market is soletreadmills. Its prices is the good value and highly recommended by many exercise trainer.
Yes , I highly recommend elliptical cross trainer to improve overall fitness since elliptical helps you improve leg strength and could give you good cardio workout.