The Last Two Interactions
So far, we have discussed gravitational force and electromagnetic force, two
forces which have a major impact on our everyday lives. There are two other
interactions which we don't notice since their range of effect is not much
larger than the size of an atom nucleus.
We depend on these two forces for the existence of the stuff from which the
world is made, and for the decay processes that make some types of matter
unstable. They impact the smallest objects in the universe and the largest.
Smallest
Largest
We thank the Berkeley
"Center for Particle Astrophysics" for the use of their
dark matter images.