It is said that there are more stars in the observable universe than there are grains of sand on earth, but there are more atoms in a grain of sand than there are stars in the observable universe.
Carbon atoms are about the same size compared to us as we are compared to the Sun, and yet atoms are still colossal compared to the particles that make them up.
I heard once that if strings do exist, if you blew up an atom to the size of the observable universe, the string in the middle would be about a meter across.
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