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Humans vs Robots
A robot can be defined as a mechanical device that is capable of performing a variety of tasks on command. Engineers design robots to perform complex tasks more easily and with greater accuracy.
Both humans and robots are able to discover new things. It is true that robots can not increase scientific knowledge as much as a human being can.
Satellites are mostly used for communication and monitoring equipment. All satellites are basically primitive robots that are controlled with minimal amount of human interference.
Scientific research and development is typically a very complicated attempt that requires practical activity from people to accomplish. Robots could be programmed to do some scientific experiments.
Also, there are two more reasons why robots are more advantageous to send into space. First, they are much safer for people. Another reason why sending robots into space is better is because of cost. It is far cheaper to send a robot into outer space, since people need much larger spacecrafts with plenty of resources to sustain human life.
However, there is only one major advantage for sending people into space that has never happened yet and that is migration. Thus, space migration is the only obvious long term solution, even though we do not have technology capabilities to do so now.
In conclusion, there are far more reasons why it is better launching machines into space instead of people, yet the necessity for the survival of the human race will depend on launching human colonies. Sending robots into space first to help create self-sustainable environments will make migration much easier for future human settlements to survive on their own.