system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How are we "stardust"? 

I've heard various quotes about how "we come from stars" and things about molecules or atoms or something forming in stars.  How does that work?  And how do they get here and make things?  I don't even know how exactly to ask this question.
gpt
The universe is almost all hydrogen or helium (the two lightest particles).

Gravity makes things pull together.  When enough hydrogen pulls together,  it ignites and makes a star.

The star runs by fusion - that is when hydrogen comes together to make helium - and releases energy.

Eventually all the hydrogen is used up, and the helium begins to fuse as well.

This works all the way up the list of elements until you hit iron.  At that point, the atoms are too heavy to fuse, and the star runs out of fuel and blows up (well, blows in and then blows up).

When the star blows up, so much energy is used that even iron can fuse - and all the heavy elements like gold and uranium and platinum are made.

Planets like Earth are made from this old star stuff.

Therefore, since you have heavy elements like iron in you, the atoms that make up part of your body were once made in a star.