system
Given the following post, respond as if you're commenting on Reddit:
human
Does the expansion of space also increase the distance between an atom's nucleus and its electron cloud?
gpt
Imagine that the expansion of space caused a 1 centimeter gap between your feet and the floor. What would happen? You would just fall back down until your feet hit the floor. The same happens with electrons around nuclei, and the planets around the sun. It's only on very very large distance scales that the effect of expansion of space is large enough to overcome the forces that hold things together.