Dark matter exerts a gravitational influence on other celestial bodies, despite being invisible and imperceptible to human senses. Although we cannot directly observe dark matter, its presence can be inferred by watching how objects in space move under its pull. This unseen force shapes the universe and affects the motion of galaxies and other structures.

In Jodi Picoult's book "My Sister's Keeper," the analogy of dark matter illustrates how some significant forces in life are not always visible. Just as we witness effects of gravity without seeing dark matter, we experience profound emotional complexities and relationships that are not always tangible or clearly defined. This highlights the unseen connections that influence our lives.