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Astro is a term that can refer to several distinct concepts, depending on the context. In astronomy, "astro" is a common prefix used to denote something related to celestial bodies, space, or the universe. For instance, an astrolabe is an ancient astronomical instrument used to determine the position of stars and planets, and astrology is a system of divination that claims to interpret the influence of celestial bodies on human affairs. Similarly, astronauts are individuals trained for spaceflight, and astrophysics is a branch of astronomy that studies the physical properties and phenomena of celestial objects.

Beyond its astronomical connections, "astro" can also be used in other, less common ways. In some casual contexts, it might be a shortened form of "astrology" when people are discussing horoscopes or zodiac signs. Less frequently, it could appear as a nickname or a brand name, unrelated to celestial themes. However, the overwhelming majority of uses for "astro" derive from its Greek root "astron," meaning star. Therefore, when encountering the term, the primary association should be with the study or contemplation of the cosmos.