Question

Are there more than three states of matter?

Answer 1

In general, we only know the four basic forms of matter: solid, liquid, gas, and plasma. However, there are various additional forms of matter in space and time that have been discovered theoretically but just a few experimentally.

Complete answer:
Based on all of the research done to date, there are a total of $22$ states of matter detailed below:
Solid: without a container, a solid has a definite shape and volume, and its particles are held very close together.
Liquid: A liquid is a condition of matter that has no defined shape but does have a defined volume that does not vary when pressure is applied.
Gas: Gases adhere to the geometry of the container while expanding to fill it.
Plasma: It is a state of matter in which free charged particles, such as electrons or any form of ions, either positive or negative, exist.
Exciton is a state of matter made up of particles known as excitons that are generated by a quantum mechanical pairing
Electron degenerate matter (EDM) can be found in the cores of white dwarf stars. The electrons are very firmly linked to the atoms in this case, although they can be transferred to neighbouring atoms.
Neutron degenerate matter: fermions, such as neutrons, are found in neutron stars, and electrons are compelled to connect with protons through the process of beta decay.
Strange matter: It can also be discovered in neutron stars' cores. It's a type of quark matter with up, down, and strange quarks that's thought to exist in neutron stars.
Photonic matter is made up of photons that behave as if they have mass and interact with one another to form photonic molecules inside a quantum nonlinear medium.
The quantum spin hall state: It is a theorised phase of matter formed from the quantum hall state.
The Bose-Einstein condensate is a state of matter in which multiple bosons behave as if they are a single wave or particle since they all share the same and collective quantum state.
Fermionic condensate: any two fermions behave as bosons in this state, and afterwards they enter the same quantum state without any restrictions.
Superconductivity: When certain substances are cooled below a threshold temperature, they reach a condition of zero electrical resistance and magnetic fields are ejected.
Superfluid: This is a type of cryogenic liquid that exists at such a high temperature that there is no resistance to its flow.
Super solid: It's similar to superfluid in that it doesn't have to deal with any motion restrictions, but it always maintains a hard shape.
Quantum spin liquid is a disordered condition in which quantum spins interact and preserve disorder at extremely low temperatures.
String a liquid net with closed loops that follow the branching principles.
Dropletons: These are quasiparticles that act like liquids.
A space-time crystal: alters its structure in both space and time is known as a time crystal.
At extremely low temperatures, Rydberg polarons contain enormous atoms.
Plasma of quarks and gluons: a high-energy state in which quarks are free to move and exist on their own.
Rydberg matter is an unusual phase generated only by Rydberg atoms.

Note:
The four fundamental states of matter are solid, liquid, gas, and plasma. Low-temperature states include superfluid, Bose-Einstein condensate, Fermionic condensate, Rydberg molecule, Quantum Hall state, Photonic matter, and Dropleton. High energy states include electron degenerate, neutron degenerate, weird matter, and quark matter.