What is Dark matter and where can you find them?

Dark matter is part and parcel of our universe. Our Universe is unlimited and weird. Being mysterious many unexpected things happen every moment. Whatever the Universe has been exploited by the humans of this Earth is very minimal and handful.

What is Dark matter?

Dark matter is part and parcel of our universe. Our Universe is unlimited and weird. Being mysterious many unexpected things happen every moment. Whatever the Universe has been exploited by the humans of this Earth is very minimal and handful. Our astronomers, cosmologists, and scientists know some things about stars, planets, constellations, galaxies, galactic clusters, comets, satellites, etc.

Earlier it was believed that the Universe consisted of only one galaxy which is ours Milky Way. But after astronomer Edwin Hubble discovered the mechanism to measure the distances of faraway celestial bodies, now astronomers suspect that the Universe contains billions of galaxies.

One galaxy may contain trillions of stars, forget about the number of planets and satellites. It is estimated that our Universe originated about 13.4 billion years ago and Milky Way is 10 billion years old now.

It is observed that rotating body movement is regulated by the gravitational forces of the body at the center. The speed of the rotating body depends upon the distance from the object at the center.

The speed of the rotating object decreases with the increase of the distance from the center. A bright example is there in our own solar system. Mercury, the nearest planet ( distance 69.146 million km from the Sun) of the solar family moves 47km per second, whereas our mother Earth (distance 151.44 million km from the Sun) orbits Sun at a speed of 30km per second.

Fritz Zwicky, the Swiss American cosmologist, in early 1930, during studying the Hubble observatory of the Coma cluster of galaxies, noticed that the stars at the periphery of the galaxy, are not being thrown away into the universe beyond the Milky Way galaxy under the influence of some unseen elements, rather keeping them bound together. Such an anomaly was not observed earlier. Zwicky opined that the yet unobserved type of mass is Dunkle Materie or dark matter. He published his finding in 1933 in the Swiss Physical Society journal.

What is dark matter and why it is not visible?

Normal matter is visible due to the presence of charged particles like electrons and protons. Activities like reflection, refraction, absorption, etc are integral parts of visible matter. But dark matter is a celestial body and a property of the Universe occupying space.

It is an invisible and dense body other than known matter. It is composed of particles that don’t absorb, reflect or emit light but light can pass through it. Unlike other known matter, it can’t be detected by electromagnetic radiation or touched. Scientists assume that dark matter consists of WIMPS (Weakly Interacting Massive Particles ).

The strange matter has gravitational force, which keeps the stars and galaxies together. It is presumed that about 26.8 % of dark matter constitutes the universe, whereas normal matter’s contribution is about 4.9 % and dark energy constitutes the rest 68.3 %. Albert Einstein was the first on Earth to observe that empty space is not empty. It has some energy and the energy is the property of space, which is believed to be expanding the Universe.

Dark energy map: credit University of California, Berkeley

The universe is originated 13.4 billion years back out of nothing for an unknown reason, infinitely beginning with smaller than an atom and it expanded infinitely within a few seconds, this unusual event is BIG BANG. At the advent of the Universe, Cosmic Microwave Background (CMB) radiation was also created and is present till now. Hindu mythology says Universe is created as Lord Vishnu wishes.

When was the dark matter created?

In the earliest, the entire Universe was filled with hot clouds of normal matters and dark matters. In due course of time normal matter settle down in stars, planets, satellites, comets, asteroids, etc.

Dark matter was created, with the creation of the universe left unattended due to its unknown characteristics.

It is scattered unevenly throughout the Universe without being detected till Zwicky’s discovery. Dark matter has gravitational force and mass but is not affected by temperature and pressure although light can pass through it.

Universe Dark Energy 1, expanding Universe, This diagram reveals changes in the rate of expansion since the origin of the Universe 13.4 billion years ago. Credit -NASA/STSci/ Ann Feild


Research is still on about this mysterious matter. COSINE-100 International team in South Korea and ANAIS-112 at Canfranc Underground Laboratory (LSC), Spain conducting experiments on the dark matter for years together could not find, any concluding evidence of dark matter in spite of following the same technology of DAMA/ LIBRA experiment in Italy. DAMA/LIBRA, Italy experiment, claimed in 2018 that the researchers had found physical evidence of dark matter in the form of flashes of light in sodium iodide crystals. They believed that the flashes were evidence of dark matter colliding with atoms in the crystals.

It is now observed that the dark matter and normal matter ratio in the Universe are 6:1, but over several decades physicists around the world trying to find the physical evidence of dark matter, and left with not having much success.

An international team of physicists, published a paper on a new theory, in the journal Physical Review Letters, in which they suggest that dark matter came from regular matter and dark matter is capable of creating more dark matter from regular matter. Now dark matter still remains an illusion for many but its existence can’t be ruled out. Whatever facts we know about Universe and dark matter are the tip of the iceberg.

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  • August 18, 2022 at 3:35 pm
    Dolaram Patel

    A pinch of salt in a water tank 20000 li tanker as for example = your thesis’s or dark matter not more than that as you think light emerges from sun like dense star as because high speed of rotetion light particle emerges in very high speed I e light speed and dissolved in the empty area I e indark Ness like above example where light density is high we called it enlighted area and where light is diminished we called it darkness in darkness we can’t find the elephant in the jungle although the stars are giving light to us but we see them in the sky does not come in our use to find the elephant in night don’t think insulted your dark matter hypothesis is like this I can tell a good example about this from an oriya paper that light evolves from darkness and also dissolves in the same darkness this is the right definition to be prooved by NASA or by scientist a great task for human being again I can want to tell that higher is the intensity lower is the wave length and lower is the intensity higher is the wavelength or vice versa isto be prooved by the scientist l have examples but no instruments in my hand to prooved it also l have seen the existence of alleans like thing their vechiles in the night indark sky having great speed more than that of our sattlites much more speed in lenear way and also changing direction instantly in 90 degree on date wise that l have written in my note book to remember them

  • August 18, 2022 at 4:36 pm
    Dillip kumar Pramanik

    I like this line “Dark matter still remains an illusions” just because it is like a hypothetical matter and still beyond our understanding. It may exists but if it is a matter it is quite difficult to understand its properties without its physical existence .

    • August 18, 2022 at 4:53 pm

      That for valuable comments

  • August 18, 2022 at 4:45 pm

    Great Article

    • August 18, 2022 at 4:54 pm

      Hope it will encourage learning process.

  • August 21, 2022 at 11:42 am
    Davis Morgan

    There’s also this other theory which is not covered in this article of “white holes” being possibly dark matter/energy; they are an antithesis to black holes that we are unable to detect as mathematically we predict that they would be smaller than a wavelength of light.

    • August 21, 2022 at 6:57 am

      Thank you very much for guidance 🙏

    • August 21, 2022 at 6:59 am

      Thank you very much for guidence🙏

  • September 10, 2022 at 7:42 am

    Such great concepts explained nicely 😍🤩🤩🔆✨💞✨✨


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