dark matter, antimatter antiparticles.

https://en.m.wikipedia.org/wiki/Gordian_Knot

https://en.m.wikipedia.org/wiki/Abyss_(religion)

https://en.m.wikipedia.org/wiki/Tartarus

https://en.m.wikipedia.org/wiki/Styx

..

https://en.m.wikipedia.org/wiki/The_Golden_Bough_(mythology)

https://en.m.wikipedia.org/wiki/Golden_Fleece

https://en.m.wikipedia.org/wiki/Phaethon

https://en.m.wikipedia.org/wiki/Titius–Bode_law

..

https://en.m.wikipedia.org/wiki/Baryon_asymmetry

https://en.m.wikipedia.org/wiki/Antimatter_weapon

https://en.m.wikipedia.org/wiki/Positron

https://en.m.wikipedia.org/wiki/Micro_black_hole

https://en.m.wikipedia.org/wiki/Planck_particle

https://en.m.wikipedia.org/wiki/Black_hole_electron

..

https://en.m.wikipedia.org/wiki/Kadru

https://en.m.wikipedia.org/wiki/Rakshasa

https://en.m.wikipedia.org/wiki/Rephaite