[Solved] What is meant by slack (or float)? 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.