<human>:  How is dark matter affecting our universe?
<bot>: Dark matter is believed to make up around 85% of the mass in the universe, and it affects the universe in numerous ways. It influences the structure of visible galaxies and clusters of galaxies and contributes to the formation of structures in the large-scale universe. Dark matter also plays a role in the evolution of the universe, providing the gravitational force necessary for galaxies to form and grow. It is thought to be the unseen force behind many important astrophysical processes, including the accelerating expansion of the universe.