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Carl Sagan
Carl Edward Sagan (November 9, 1934 – December 20, 1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).
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Planetary scientist
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Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars, and galaxies.
Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these...
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Physicist
A physicist is a scientist who studies or practices physics. Physicists study a wide range of physical phenomena in many branches of physics spanning all length scales: from sub-atomic particles of which all ordinary matter is made (particle physics...
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Scientist
A scientist, in the broadest sense, is any person who engages in a systematic activity to acquire knowledge or an individual that engages in such practices and traditions that are linked to schools of thought or philosophy. In a more restricted...
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Writer
A writer is anyone who creates a written work, though the word usually designates those who write creatively or professionally, as well as those who have written in many different forms.
The word is almost synonymous with author, though somebody who...
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