If you google “Observer Effect,” most of the search results will lead to some quasi-scientific mumbo-jumbo where it’s even linked to psychology and religion. In reality, it’s simpler: no measurement (and observation is a form of measurement) can be made without affecting the system being measured, and at the photon level, this influence becomes stronger than the phenomenon being measured. But in truth, almost no one fully understands it yet 🙂 I came across a very articulate article on the topic. Highly recommended, the subject is incredibly complex, but everything is explained very clearly in the link.
Hi, I'm Rauf Aliev. 