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NASA uses a lot of robots to help us explore space!  Some examples are listed here.  Some benefits of robots include not having send a human into space and have to worry about them getting hurt. Some challenges are building the robots to properly function.  My opinion is that robots are going to be the future of space discovery. There won't be any need for astronauts any more and we can effectively send robots to increase our understanding of space. Also, sending robots would be much cheaper that sending humans.

NASA has been able to come up with some amazing stuff which can help with exploration on various space bodies such as the use of the Hedgehog for tumbling on comets and asteroids. NASA even made robots to use on things that weren't in the space. IceWorm is a project which can climb up Antarctica's mountains---something which humans cannot do as carbon dioxide levels are too high at some point. The use of robots is much safer than sending humans out (obviously).

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NASA is testing a new robot which will be used to climb the icy mountains of Antarctica. The highest peaks of the mountain have too much carbon dioxide for humans to handle, and this is where IceWorm will come in.

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Meet IceWorm: NASA's New Ice-Climbing Robot - Eos

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A robot that can inch up icy surfaces may help scientists reach new heights in some of Earth's most dangerous and remote landscapes.

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This is NASA's ATHLETE robot.

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This is NASA's robotic arm to help make the lives of astronauts much easier.

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This is NASA's humanoid robot.

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This is NASA's Mar's rover.

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Hedgehog is a special robot which has the abilities to maneuver on a small body such as a comet or asteroid.

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NASA uses robotics in many ways. For example, robotic arms can help move heavy objects in space and fix problems in the space station. Robots have been really helpful to astronauts and can help them discover new areas in space.

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Robotics is the study of robots. NASA uses these machines in many different ways.

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This is NASA's PUFFER robot and can explore extreme terrains.

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Robots are sent to space because we don't have to worry about any lives being lost or hurt. Also sending a robot is much more cheaper than sending a human.

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Why Do We Send Robots To Space? | NASA Space Place – NASA Science for Kids

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We can send robots to explore space without having to worry so much about their safety. Learn more!

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This is the robot Puffer. In the video, this robot can sense obstacles and move around accordingly.

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PUFFER: Senses obstacles and self-adjusts appropriately.