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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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12y ago

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