According to a dictionary, astronomy means the science that deals with the material universe beyond the earth's atmosphere. So an astronomer means a scientist that studies and deals with the material universe beyond the earth's atmosphere. Then we would ask a question: "What is there to studies or to deals with beyond the earth's atmosphere?", perhaps there are a whole lot more things going on beyond the earth's atmosphere than most of us thought it would be.
So what is the area beyond the earth's atmosphere and what do we call it? For most people, they called it space. So when we talk about space, stars, planets and galaxies would just pop in our heads. And when we talk about astronomers, we automatically think that they are scientists whose are studying about stars, planets and galaxies. For me, I think that is only 50% correct.
In my opinion, an astronomer would has a great knowledge about stars, planets, galaxies etc... They would basically know how is our universe work and what happened and why is it there etc... Also, an astronomer would have to be proficient with their tools that they use to look into the space which is their telescopes in observatory.
So what do I think an astronomer does? For the majority of astronomers are working in many observatories right now, I would think that they are still trying to figure out all the stars and planets and galaxies in our universe. They are also trying to discover new stars, new planets etc... But for the ultimate reason, they are trying to find a planet that has life like the earth that we live in right now. I'm sure we are all want to know if there is another planet can provide life like the earth do and we want to know is there another specie in that planet and for most of the time we called it alien.
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