* Our Eyes Adapt: When we move from a bright environment to a dark one, our pupils dilate to let in more light. This takes time, and as our eyes become more sensitive, we start seeing fainter objects, including stars. This process of adaptation is called dark adaptation.
* Light Pollution: In urban areas, artificial light from buildings and streetlamps washes out the night sky, making it difficult to see faint stars. The further away you are from light pollution, the more stars you can see.
So, it's not the stars appearing one by one, but rather our eyes gradually becoming capable of detecting them as they adapt to the darkness.
Let me know if you have any other questions!
