Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Observational astronomy is a branch of astronomy that is concerned with gathering data, in contrast with theoretical astrophysics, which is mainly concerned with finding out the measurable implications of physical models. It is the practice of observing celestial objects by using telescopes and various other astronomical apparatus. Learn more about how scientists reveal the mysteries of the universe with observations and measurements in this book.
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