Scientific work often starts when someone notices a repeatable pattern. An observation such as “this surface stays warmer in sunlight” can suggest a question about colour, material or exposure. A hypothesis proposes a possible explanation that can be tested against further observations.
The important move is to separate what you saw from why you think it happened. If several things changed together, a fair test may vary one factor while keeping others as similar as practical. Results can then refine or challenge the explanation.