High Quality Content by WIKIPEDIA articles! Sadao Sei was a Japanese astronomer. He discovered the asteroid 2909 Hoshi-no-ie on May 9, 1983. 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 phenomena and the differences between them using physical laws. Today, that distinction has mostly disappeared. Professional astronomers are highly educated individuals who typically have a PhD in physics or astronomy and are employed by research institutions or universities.
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