Greetings from Mars
You have probably seen pictures of robots. Imagine that a robot could talk to you about itself. It might say something like this.
Hello, my name is Curiosity. I didn't grow from a seed or an egg, as plants and animals do. People made me to explore Mars. Mars is a planet that humans hope to visit one day.
That's where I am now. I set off from Earth in 2012.
You and I do many of the same things, but we do them in different ways. When you move around or pick things up, you use your muscles. The power they have comes from the food you eat. Each move I make is caused by a little motor. I have many inside me. Their power comes from electricity. My computer controls all of them.
I don't have eyes. In their place I have television cameras.
They send pictures to my computer. I can look to the right or left, up or down, wherever the computer tells me to. If I am exploring a place with many boulders, my television cameras tell my computer. Then it helps me go around them.
If I get too close to a cliff, my computer again helps me move out of danger. I don't have ears either. Instead my antenna picks up messages sent by humans back in the United States.
It also sends messages back to them.
I do all kinds of work. Some jobs I do better than humans.
This is because I never get tired. As long as I have electricity, I keep on working. I can also work in places where it is difficult for people to go. On Mars, there is no air and very little water.
Humans need both. I get along just fine without them.
Some robots stay in one place. I move around on six wheels. If I find myself going down a slope, my computer keeps me from falling over. If that were to happen, I wouldn't be able to get back on my wheels again. Just like people, I have to keep my balance. I don't want to have an accident while I'm moving about.
You have two arms. I have only one. It has joints in it, like your wrist and elbow, but my arm is made of metal. It has a scoop at the end of it that I can use to dig into the ground.
Everything I learn goes into my computer. Humans built me to find out what it is like here on Mars. They will use what they learned when the first humans come here.
I will never return home to Earth. How do I feel about that? Well, I don't have feelings. I'm never sad, but I'm also never happy. That's because I'm a machine. So staying here on Mars doesn't bother me at all.
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