system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does one rationalize the following two statements: 1) Space is infinite and 2) The Universe is expanding?

How is it that something that is infinite can get larger?
gpt
When we say the universe is expanding, we mean that everything is getting further away from everything else (at least before gravity gets involved and pulls nearby things towards each other). 

Take the infinite number line, and move the number 1 to 2, 2 to 4, 3 to 6 and so on. The resulting line has the same amount of numbers on it as the original, and is infinite like the original, but any two numbers are now twice as far apart as they were before.