system
Given the following post, respond as if you're commenting on Reddit:
human
Why do we call elements above uranium man-made?

This is a trope I've heard repeated over and over since grade school, that elements higher than uranium don't exist in nature and are only man-made.  Doesn't that seem a bit arrogant considering the awesome forces in supernovas and black holes?
gpt
We call them man made, because with the exception of trace amount of neptunium and plutonium, they don't exist on earth unless manufactured.  They most certainly did exist in supernovae, but since we are 4 billion year removed from the last one, they have decayed away and aren't available to us anymore, unless we make them.