An advantage is that people can accomplish missions from far away or that can be dangerous and the disadvantage is that it may not work and it will take a long time to learn how to control it. Also the disadvantage is that the if the robot is in space and it fails then the people from NASA will have to go to space and get the robot.
Above, it shows a Tele-robot that they use on Mars and it is called a Rover. The photo shows what each part of the rover is which is fascinating too.