will mars robotic rover "curiosity' comes back to earth?

Curiosity is a little chemical laboratory on wheels. It does not merely collect samples. It collects and analyzes them. All of the analysis that needs to be done will be done in place, on Mars. The only thing that will return to Earth will be data transmitted by radio. Eventually the power plant or other systems will fail and Curiosity will be another piece of trash on Mars waiting for the day humans ever arrive to treat is as an archaic relic of their distant past.

No.

The Curiosity has no capability of returning. The only rockets it had were used up during landing, were jettisoned, and crashed on Mars. NO measures were taken to protect it from the extreme heat of re-entry, since there were never any plans to bring it back.

The Curiosity is not just a simple "gatherer". It is a mobile LABORATORY, and it ALSO contains all the equipment necessary to perform the experiments the scientists want done. It cannot do ALL experiments, but only the one scientists thought to be the most important.

The results from the experiments are recorded by computers, and are sent back to earth using radio signals -- just like the picture are.

Once the experiments are completed Curiosity's job is done. Scientists will find some more things for its cameras to look at, but when its batteries die or the computer fails, it will be left to rot in the Martian atmosphere.

No, there is no way for Curiosity to return to Earth (or even Earth orbit). If you consider that a return mission would require an additional rocket engine and propellant, you will see that that would be a much more complex mission... As it stands, Curiosity is by far the most advanced laboratory that has ever been sent to another planet - all that the mission requires is that the rover can send the information that it collects 'back home' to be analysed back here on Earth.... I don't think there has ever been a 'sample-return' mission ever contemplated that will handle the amount of data that Curiosity will.

No. Curiosity MARS Rover will never return to Earth. There were never any plans to return it to its origin point. There is no return rocket, no heat shield for the return flight re-entry into Earth's atmosphere, and no plans to return the Martian soil and rock samples to Earth. All of the samples collected by Curiosity will be examined by a series of laboratory instruments aboard the Curiosity Rover and the results of those examinations will be radio transmitted back to Earth. All of the information on Curiosity, and its capabilities, may be found on the www.nasa.gov website. The first trip Curiosity will make is over to a bedrock formation which has multiple layers of bedrock to begin studies of how the surface of Mars evolved. This particular first trip will be a very short drive, and it will test out not only the driving performance, but many of the lab instruments and radio links as well.

No, it's not designed to come back to earth. The rockets weren't designed to lift it off the surface and the rockets and heat shield both crashed into the surface uncontrolled as part of the landing. The planned mission is 2 years, the power source could potentially power it for 14 years. The rover has several scientific instruments, like a microscope, an x-ray diffractometer, and a quadrupole mass spectrometer for analyzing the samples on Mars. All it needs to send back is the data.

I suppose it's possible, in 100 years or so when human travel to and from Mars is more common and as easy as going into Earth orbit is now, we could bring it back and put it in a museum.

No. It has no rocket engine or fuel to leave Mars. The rover has small chemical instruments on it that are remote controlled from Earth.

You are right that if an any future sample return mission is flown it will have to take measures to ensure the returning space craft cannot release microbes from Mars (in case any exist there) into the environment on Earth.

Well... It is not designed to return to earth by itself but there is no reason we could not go get it and bring it back at some point in the future.

Since it is designed to stay on Mars, it has everything it needs to do the science it was meant to do including sending the results of it's testing back to earth (just like it is sending photographs back to earth).

With computers sending information over "wireless", a photograph is just a string of zeros and ones, exactly like any other data.

No. There are no plans to return Curiosity to Earth and there is no way to return it. It has no rockets to take off from Mars, and no way of landing safely if it somehow reached Earth. This is a one-way trip. That's why we are sending robots rather than humans to Mars. The return voyage requires too much equipment and fuel. The weight is better allocated to better cameras and research tools.

I agree with the others. Curiosity only sends radio transmissions back to Earth. A Mars sample return mission which will indeed bring back rocks and soil is being planned and might be accomplished by 2020. Alot depends on who is in the Whitehouse in the coming years. Generally, Obama has cut the NASA budget by ending the shuttle program (good in my opinion) and defunding its replacement, called Constellation (bad in my opinion), as well as having NASA pull out of several joint international ventures due to lack of funding. It all depends on the funding.

Curiosity is not designed to return to Earth, nor is it designed to return any physical samples to Earth. It cannot do that. The only thing that it can return to Earth is data in the form of radio transmissions.