Dark Matter: Dark matter is a hypothetical form of matter that cannot be seen directly but accounts for the majority of the matter in the universe. It interacts gravitationally with normal matter and plays a crucial role in the formation of large-scale structures in the cosmos.
Gravitational Lensing: Gravitational lensing is the bending of light by the gravitational field of massive objects, such as galaxies or galaxy clusters. It can be used to infer the presence and distribution of dark matter in the universe.
Cosmic Microwave Background: The Cosmic Microwave Background (CMB) is the oldest light in the universe, originating from the time when the universe became transparent to radiation, approximately 380,000 years after the Big Bang. It provides crucial information about the early universe and the distribution of dark matter.