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Dark matter and dark energy #vigyanrecharge
What is dark matter?
Can we detect dark matter?
Neil deGrasse Tyson: What is Dark Matter? What is Dark Energy?
Dark matter: The matter we can't see - James Gillies
What is Dark Matter and Dark Energy?
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What is Dark Matter?
Dark matter is a mysterious component of the universe that doesn’t emit, reflect, or absorb light or any other form of electromagnetic radiation (such as X-rays or radio waves).
Unlike ordinary matter (which includes stars, planets, and galaxies), dark matter cannot be directly detected by instruments due to its lack of luminosity.
Scientists infer its existence from its gravitational attraction, which affects the motion of visible matter in the cosmos 1.
Composition and Distribution:
Dark matter constitutes approximately 30.1% of the total matter-energy composition of the universe.
The remaining components are dark energy (69.4%) and the familiar visible matter (0.5%).
Originally known as the “missing mass,” dark matter was first inferred by Swiss American astronomer Fritz Zwicky in 1933.
Zwicky discovered that the mass of stars in the Coma cluster of galaxies accounted for only about 1% of the mass needed to prevent the galaxies from escaping the cluster’s gravitational pull.
American astronomers Vera Rubin and W. Kent Ford later confirmed its existence by observing similar phenomena within individual galaxies 2.
Invisible Influence:
Dark matter’s gravitational effects are crucial for understanding the structure and dynamics of the universe.
It plays a significant role in galaxy formation, galaxy clusters, and the large-scale distribution of matter.
Despite its abundance, dark matter remains elusive, as it interacts only through gravity 3.

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