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What do you call a scientist that studies the stars?

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A scientist who studies stars as a career is called an astronomer.
If he specialises in the physics of the stars, he would be an astrophysicist.
A person who studies the stars is called an astronomer. They partake in the branch of study that is called astronomy.
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How do scientist study the star?

They monitor were and how they move they look at the stars through telescopes and get a detailed look at the star so they can build they own models of it