What goes on inside a star is better understood than one might guess from the difficulty of having to look at a little dot of light through a telescope, because we can calculate what the atoms in the stars should do in most circumstances.
Atoms are very special: they like certain particular partners, certain particular directions, and so on. It is the job of physics to analyze why each one wants what it wants.
The most remarkable discovery in all of astronomy is that the stars are made of atoms of the same kind as those on the earth.
I, a universe of atoms, an atom in the universe.
If all of this, all the life of a stream of water, can be nothing but a pile of atoms, how much more is possible?
What would happen if we could arrange the atoms one by one the way we want them?
Everything is made of atoms.