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The opportunity cost of a firm using its own capital is
Amateur Stargazing
The hobby of observing celestial bodies, such as stars, planets, and moons, usually with the naked eye or with telescopes, without professional equipment or expertise.
Astronomy
The scientific study of celestial objects, space, and the universe as a whole.
Telescope
An optical instrument designed for the observation of remote objects by collecting electromagnetic radiation.
Astronomical Club
An organization for individuals who share an interest in astronomy, often facilitating observations, discussions, and educational events.
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