The observed rotation curves of galaxies indicate that the outer regions of galaxies rotate faster than expected based on the visible matter alone, suggesting the presence of additional mass, or Dark Matter.

Dark Matter is estimated to make up approximately 27% of the total energy density of the universe, while ordinary matter (baryonic matter) makes up only about 5%.

Weakly Interacting Massive Particles (WIMPs) are hypothetical particles that are massive but interact very weakly with ordinary matter, making them difficult to detect.

Direct detection experiments aim to detect Dark Matter particles directly through their interactions with sensitive detectors.

Dark Matter plays a crucial role in explaining various cosmological observations, including the rotation curves of galaxies, the formation of galaxies and large-scale structures, and the expansion rate of the universe.

Dark Matter's weak interaction with ordinary matter, its low density, and its lack of electromagnetic radiation make it extremely difficult to detect directly.

The expected mass range of Dark Matter particles is typically between 10^-22 eV and 10^-6 eV, although some theories suggest a wider range.

Dark Matter halos are believed to be the seeds for galaxy formation, providing the gravitational pull necessary for gas and stars to clump together. Dark Matter also influences the distribution of galaxies in the universe.

The exact impact of Dark Matter on the expansion of the universe is still uncertain and a subject of ongoing research.

The implications of Dark Matter for the future of the universe are still unknown and depend on its properties and the overall fate of the universe.

The observed rotation curves of galaxies, where the outer regions rotate faster than expected based on visible matter alone, provided the first strong evidence for the existence of Dark Matter.

Dark Matter's weak interaction with ordinary matter, its diffuse distribution, and the small size of its particles make it challenging to detect directly.

Black Holes are not typically considered a viable explanation for Dark Matter, as they are composed of ordinary matter and would not exhibit the properties expected of Dark Matter.

Studying Dark Matter poses several challenges, including its elusive nature, the vastness and complexity of the universe, and the limitations of current technology and experimental techniques.

Dark Matter has the potential to provide insights into the fundamental laws of physics, explain the origin and evolution of galaxies and large-scale structures, and shed light on the ultimate fate of the universe.