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The root word astro comes from the Ancient Greek word ἄστρον (astron) meaning celestial body (such as a star, asteroid, etc.) Therefore, astro is used predominantly as a prefix to refer to anything outside of the earth's atmosphere such as astronomy, astronautics and astrobiology.

The root word aster (star) is directly related to astro and can be seen in English words such as asteroid and asterisk

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βˆ™ 11y ago
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βˆ™ 6mo ago

The Greek root word "astro" means star. It is commonly used in English to refer to celestial bodies and celestial phenomena, such as astronomy (the study of celestial objects) and astrophysics (the branch of astronomy that deals with the physics of the universe).

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βˆ™ 13y ago

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Q: What is the greek root word astro?
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