system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we know that most of an atom is empty space? And since that is so, why can’t we just walk through solid objects?
gpt
Think of it like a net. A net is mostly empty space  it we can’t walk through it. There are bonds on energy holding all the atoms together. It takes some amount of energy to break those bonds like it does to break the net.