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Dark Matter:

What is it?
Dark matter is an invisible, non-luminous form of matter that makes up approximately 27% of the universe's total mass-energy density.

Properties:

1. Invisible: Doesn't emit, absorb, or reflect any electromagnetic radiation (light).
2. Non-luminous: Doesn't interact with light.
3. Non-baryonic: Not composed of ordinary matter (baryons).
4. Collisionless: Particles interact only through gravity.

Effects on the Universe:

1. Galaxy Rotation: Dark matter provides gravitational stability.
2. Galaxy Clusters: Holds clusters together.
3. Large-Scale Structure: Influences universe's web-like structure.
4. Cosmic Microwave Background: Affects radiation patterns.

Theories and Candidates:

1. WIMPs (Weakly Interacting Massive Particles).
2. Axions.
3. Sterile Neutrinos.
4. Modified Gravity Theories.

Detection Methods:

1. Gravitational Lensing.
2. Galactic Rotation Curves.
3. Cosmic Microwave Background.
4. Direct Detection Experiments.

Why is Dark Matter important?
Understanding dark matter helps explain:

1. Universe's evolution.
2. Galaxy formation.
3. Cosmic structure.

‪@themiscellaneousmind2024‬