Question

best answer will be mqrked as brain liested
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.what is meant by dark matter

Answer 1

Dark matter is a hypothetical form of matter that is thought to account for approximately 85% of the matter in the universe, and about a quarter of its total energy density. The majority of dark matter is thought to be non-baryonic in nature, possibly being composed of some as-yet undiscovered subatomic particles.

Answer 2

Hey!

I haven't read much about dark matter but I'm concluding what I've learned about it till now.

There are two main classes; in one the dark matter is in the form of individual elementary particles, while in the other it is in some type of compact astrophysical object formed from many particles.

It's also said that most of the material in universe is called the dark matter. Dark matter is a promising target for research. We know it exists, but we do not yet know what it is at a fundamental level, making it a hypothetical form of matter.

The most significant sign of the existence of dark matter, however, is our very existence. Despite its invisibility, dark matter has been critical to the evolution of our universe and to the emergence of stars, planets and even life.
Perhaps, astronomers know dark matter exists because visible matter doesn't have enough gravitational muster to hold galaxies together.

The prediction of non-baryonic dark matter is one of the boldest and most striking in all of cosmology, and if ultimately verified, for example by direct detection of dark matter particles, will be amongst cosmology's most notable successes.

A light neutrino would be a type of dark matter known as hot dark matter, meaning that the particles have relativistic velocities for at least some fraction of the Universe's lifetime.

Hope it helps!