The composition of the universe draws some important matters & energy which not only are different but interrelated. These include; dark matters, dark energy, and normal matter. While the important ones include the normal matter at an estimated 4%, dark matter at 21%, the rest of the universe is made of dark energy (Kumar & Nunes, 2017). Easily confused, dark matter and dark energy are different.
According to Shedding light on dark matter - Patricia Burchat (2019), dark matter is the ‘staff that makes it possible for galaxies to exist and doesn’t reflect or emit light. It consists of unseen particles which bind with the universe, and it's hard to be seen through the telescope, but can be located by astronomers via its gravitational effects on its surroundings as well as the detectable x-rays that it emits. It is not clouds of normal matter. Dark energy is defined as the force that is responsible for the acceleration of the expansion of the universe. In other words, it’s a form of energy that is postulated to act against gravity, but to occupy the universe accounting for most of the energy in it. While the known/normal matter is known to exert gravitational forces it is not enough to hold the galaxies together and hence the reason explaining the existence of an additional source gravitational, which makes it enough for galaxies to hold (Benisty & Guendelman, 2017).
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While dark matter is a force that enables the universe to be together and explains the cohesion of the galaxies and stars, dark energy on its side pushes the force apart. Comparing the two, dark energy repels while dark matter attracts. On the other hand, dark matter influence is depicted even on individual galaxies while dark energy is known to act only on the scale of the whole universe. Despite their influence in the existence of the universe, both dark energy and dark matter were both forged in the big bang and remain mysterious (Kumar & Nunes, 2017). In summary, it can be said that dark matter is repayable for the production of attractive force which is gravity, while dark energy on its side is responsible for the repulsive force (anti-gravity) and neither can be seen.
References
Benisty, D., & Guendelman, E. (2017). Interacting diffusive unified dark energy and dark matter from scalar fields. European Physical Journal C -- Particles & Fields , 77 (6), 1–10.
Kumar, S., & Nunes, R. (2017). Observational constraints on dark matter-dark energy scattering cross section. European Physical Journal C -- Particles & Fields , 77 (11), 1–6.
Shedding light on dark matter - Patricia Burchat. (2019). Retrieved 3 October 2019, from https://www.youtube.com/watch?time_continue=183&v=bZW_B9CC-gI
