Observer (quantum physics)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In quantum physics, an observer is an entity that determines an observable (a property of the system state) by a sequence of physical operations. The phenomena of the cosmos require an observer in order to be learned about and understood by us. The observer can take many forms, for example: 1. A person watching amoeba through a microscope; 2. A person watching an ocean sunset; 3. A spacecraft monitoring a distant asteroid (and transmitting data to earth); 4. A person conducting an experiment in a laboratory.