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Dark matter

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Dark matter

W
What If” Scenarios

1 Views • Dec 14, 2025

Wikipedia Context

In astronomy and cosmology, dark matter is an invisible and hypothetical form of matter that does not interact with electromagnetic radiation, including light. Dark matter is implied by gravitational effects that cannot be explained by general relativity unless more matter is present than can be observed. Such effects occur in the context of formation and evolution of galaxies, gravitational lensing, the observable universe's current structure, mass position in galactic collisions, the motion of galaxies within galaxy clusters, and cosmic microwave background anisotropies. Dark matter is thought to serve as gravitational scaffolding for cosmic structures. After the Big Bang, dark matter clumped into blobs along narrow filaments with superclusters of galaxies forming a cosmic web at scales on which entire galaxies appear like tiny particles.

Full Article

Description

Dark matter is one of the greatest mysteries in modern science.
Although it cannot be seen directly, scientists believe dark matter makes up a large portion of the universe and plays a key role in how galaxies form and move.

This video explains what dark matter is, why scientists believe it exists, and how it influences the structure of the universe.

▶ Topics covered:

What dark matter is

Why it cannot be seen

Evidence from galaxy movement

Its role in the universe