Mars is actually half the size of earth. There are still some speculations about the planet. Some are saying that this might be an actual planet wherein people can transfer and live. This is not possible yet at present time. Mars has a weird atmosphere that does not contain oxygen. If those who are in charge of checking out the planet can make use of technologies, the place can be livable.
Just remember that this is not something that will occur anytime soon. There are still a lot of differences that should be noted about Mars such as its gravitational pull. Weight will be different for people who are here on earth with the people who are in Mars.