Dark matter remains one of the

Position 1: Until a detection method is developed that can identify dark matter particles directly, its true nature will continue to elude scientists.

Position 2: Unlike ordinary matter, it does not emit, absorb, or reflect light, making direct observation impossible with current instruments.

Position 3: These effects include the anomalous rotation curves of spiral galaxies, which spin far too quickly at their outer edges to be explained by visible mass alone.

Position 4: Dark matter remains one of the most perplexing unsolved problems in modern astronomy.

Position 5: Nevertheless, astronomers infer its existence from the gravitational effects it exerts on visible galaxies and galaxy clusters.