What are some theories on dark matter?

The existence of dark matter can be traced back to the pioneering discoveries of Fritz Zwicky and Jan Oort that the motion of galaxies in the Coma cluster, and of nearby stars in our own Galaxy, do not follow the expected motion based on Newton’s law of gravity and the observed visible masses.

What is currently known about dark matter?

We know how much dark energy there is because we know how it affects the universe’s expansion. Other than that, it is a complete mystery. Dark matter makes up about 27\%. The rest – everything on Earth, everything ever observed with all of our instruments, all normal matter – adds up to less than 5\% of the universe.

What are the modern theories of the universe?

The two main theories are the big-bang hypothesis and the steady-state hypothesis, with many variations on each basic approach. According to the steady-state theory, now of historical interest only, the universe expands, but new matter is continuously created at all points in space left by the receding galaxies.

What is the best theory of dark matter?

Most dark matter is thought to be non-baryonic in nature; it may be composed of some as-yet-undiscovered subatomic particles. The primary candidate for dark matter is some new kind of elementary particle that has not yet been discovered, in particular, weakly interacting massive particles (WIMPs).

What is Stephen Hawkings theory?

The black hole area theorem, which Hawking derived in 1971 from Einstein’s theory of general relativity, states that it is impossible for the surface area of a black hole to decrease over time. Black holes have an entropy, and it’s proportional to their area.

What is quantum string theory?

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other. Thus string theory is a theory of quantum gravity.

Is there proof of dark matter?

Certainly, there’s no definitive proof that dark matter exists—unless, of course, you take the gravitational forces and occasional snippets of wisdom from other studies to be enough proof to believe in dark matter without further evidence.

What is the theory of dark matter?

Two theories to explain the composition of dark matter are Hot Dark Matter theory (HDM) and Cold Dark Matter theory (CDM). The main difference between the two theories is the speed of the candidate particles. As you may have guessed, HDM particles move quickly (and are thus “hot”) while CDM particles move slowly.

What are some examples of dark matter?

Dark matter. Dark matter is the term astronomers use to describe material in the universe that does not emit or reflect light and is, therefore, invisible. Stars, nebulae, and galaxies are examples of luminous objects in the sky.

What is the evidence of dark matter?

As more evidence is found of the existence of dark matter, scientists are investigating what it actually is. A theory was that MACHOS (Massive Compact Halo Objects) were responsible for dark matter. Objects such as stellar remnants, faint stars and black holes were thought to be responsible for all the missing mass.