When there is a shuttle in space, how does it continue to go? How does it navigate there,I heard there is no?

A way to visualize what an orbit is is to think of a big canon on a mountain 5 miles above the Earth. When you fire the canon, the cannonball will shoot out but eventually arch back towards the Earth and hit it. If you shoot it faster and faster it will go further before landing. If you shoot it fast enough, it will follow the curve of the Earth until eventually, it will come back to where it started. At this point it keeps going around until the air slows it down enough to come to the ground. Since space doesn't have much air, an object which is going fast enough will just keep going in circles (like the Energizer Bunny).

This brings us to your second question. How do you turn, navigate, get back to Earth if there is no air. Luckily, Newton and the Chinese found that if you shoot a gas at high speed out of an object, the object will move in the opposite direction. By firing thrusters, the Shuttle can turn and by firing braking rockets, slow down enough to get back to Earth.

http://spaceplace.nasa.gov/en/kids/orbits1.shtml

It continues to "go" using the speed it got on launch. That speed puts it into an orbit, which is literally just falling around the earth in a circle. Since there's very little air where it orbits (but there is *some*), there's not much drag and it'll keep its orbit for a long time.

It maneuvers in space by using little jets of gas -- fire gas jet on one side, the ship moves to the other side. They're called "reaction thrusters" because they're based on the principle of every action has an equal and opposite reaction :) Reaction thrusters on all sides of the shuttle let it move in any direction small amounts.

The Space shuttle moves by means of small thrusters called the Reaction Control System (RCS) and as was said, they are called this because of Newton's third law of motion "every action has an equal and/or opposite reaction" the space shuttle changes it's attitude and altitude in orbit by means of this, also the RCS is used to slow the shuttle down below 17,000 mph to "drop" into earth's atmosphere. once it encounters the atmosphere, at around 400,000 Feet MSL (Mean sea level) it's aerosurfaces (rudders, alerons, etc. become active.

When an object is in orbit, it continues moving at the same speed, as there is nothing to drag it down. The moon is also in orbit around the earth, but at a much higher altitude, and it too keeps going, because there is nothing to slow it down.

While in space, the shuttle adjust its speed, altitude and attitude using small rockets.

When the shuttle wants to come down, it has to use its engine as retro rocket to slow down; once its speed is too low to remain in orbit, is drifts down until it reaches denser atmosphere, which drags it down further.

The original launch gives the shuttle its momentum which keeps it going around the earth. Small adjustments in direction are achieved with small maneuvering thrusters (like small rockets that shoot one way and nudge the shuttle in the opposite direction.

There is no air or wind there. You are correct.

As a result, space vehicles do not have working rudders,

or steering wheels as such. Instead they have steering

rockets - small rockets that fire only briefly to correctly turn,

rotate, or position the space vehicle in its proper (or desired)

position relative to something else.

It only uses the airplane like parts of it (wings etc) for final landing. Otherwise it uses small jest to change position or it's main engines to re-enter.

They use a wind up spring.