As of my knowledge cutoff in September 2021, there is no known substance or force in the universe that is considered stronger than dark matter. Dark matter itself is not a force but rather a hypothetical form of matter that is inferred to exist based on its gravitational effects on visible matter and structures in the universe.

Dark matter interacts gravitationally with normal matter but does not interact significantly with electromagnetic radiation, which is why it is considered “dark” and not directly observable with current technology. Its existence is inferred from observations of the rotational speeds of galaxies, gravitational lensing, and the large-scale structure of the universe.

Dark matter is estimated to make up about 85% of the total matter in the universe, while ordinary matter, including atoms, comprises only a small fraction. Despite its significant presence and influence on the dynamics of the universe, the nature of dark matter remains one of the biggest mysteries in astrophysics and particle physics.

Scientists have proposed various theories and particle candidates to explain dark matter, such as weakly interacting massive particles (WIMPs) or axions, but direct detection or conclusive evidence for any specific dark matter particle is yet to be achieved.

It is important to note that the concept of “strength” in this context refers to the influence or interaction of a substance or force with other particles or fields. Dark matter, by its nature, exhibits gravitational effects on normal matter, but it does not possess characteristics such as electrical charge or nuclear forces that would make it “stronger” in the conventional sense.

That being said, scientific knowledge is continually evolving, and new discoveries and theories may emerge that could shed light on the nature of dark matter or uncover other forms of matter or forces that could be considered stronger or more influential in the future.