Dark matter

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For something to be considered matter, it must exist and does not allow other matter to occupy the same space as itself. It must interact with gravity and possess inertia at its rest state. It must be able to possess energy. Atoms are made up of sub-atomic particles, made up of elementary particles themselves. Atoms are made up of protons, neutrons and electrons. Electrons possess little mass as it has little interaction with the Higgs field.

Protons are made up of 2 up quarks and 1 down quark, while neutrons are made up of 1 up quark and 2 down quarks. The quarks are bound by gluons.
A four-by-four table of particles. Columns are three generations of matter (fermions) and one of forces (bosons). In the first three columns, two rows contain quarks and two leptons. The top two rows' columns contain up (u) and down (d) quarks, charm (c) and strange (s) quarks, top (t) and bottom (b) quarks, and photon (γ) and gluon (g), respectively. The bottom two rows' columns contain electron neutrino (ν sub e) and electron (e), muon neutrino (ν sub μ) and muon (μ), and tau neutrino (ν sub τ) and tau (τ), and Z sup 0 and W sup ± weak force. Mass, charge, and spin are listed for each particle.
By MissMJ - Own work by uploader, PBS NOVA [1], Fermilab, Office of Science, United States Department of Energy, Particle Data Group, Public Domain, Wikimedia Commons

Three colored balls (symbolizing quarks) connected pairwise by springs (symbolizing gluons), all inside a gray circle (symbolizing a proton). The colors of the balls are red, green, and blue, to parallel each quark's color charge. The red and blue balls are labeled "u" (for "up" quark) and the green one is labeled "d" (for "down" quark).
A proton
By Jacek rybak - Own work, CC BY-SA 4.0, Wikimedia Commons
Gluons are bosons. Fermions carry mass, and bosons carry the force that gives mass. Due to the Fermi-Driac Distribution, particles of the same spin cannot co-exist in the same place at the same time.

Gluons interact with other particles to convey energy. The strong force within the gluons allow matter to interact with other matter.

Dark matter was discovered by a Dutch astronomer, Jan Oort, when he realised that the theoretical mass of the Milky was higher than the amount of matter in the Milky Way. He inferred that so-called "invisible matter" was at play. Virial theorem theorises dark matter. 

Fritz Zwicky was the one who made an inference that there is more dark matter than visible matter, by studying red shifts from various galaxy clusters.

The speed a galaxy rotates is predicted to increase until a distance in which it would decrease. However, the speed remains constant when observed.

I learnt about atoms and what makes them up. I didn't learn much about dark matter, but I know they cannot interact with normal matter. I wanted to learn about how scientists plan to make their own dark matter. People could have waited until the end of the lesson to ask questions, instead of repeatedly asking irrelevant questions at the wrong time.

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