Hello, ladies and gentlemen.
We are here to give you a detailed explanation
about dark matter, and dark energy.
What is dark matter and why are scientists
so eager to find it?
95% of the universe is missing.
We can’t see it; we don’t know what it’s
made of; and we’re not even entirely sure
it exists, but what we do know is that there’s
a great deal more to the universe than meets
the eye.
The space between galaxies in clusters is
filled with a hot gas.
This invisible stuff is called dark matter,
which is the most mysterious, non-interacting
substance in the Universe.
Its gravitational effects are necessary to
explain the rotation of galaxies, the motions
of clusters, and the largest scale-structure
in the entire Universe.
Dark matter and dark energy are the yin and
yang of the cosmos.
Dark matter produces an attractive force (gravity),
while dark energy produces a repulsive force
(antigravity).
Astronomers know dark matter exists because
visible matter doesn't have enough gravitational
muster to hold galaxies together.
Dark matter is called dark because it does
not appear to interact with observable electromagnetic
radiation, such as light, and so it is undetectable
by existing astronomical instruments.
Originally known as the “missing mass,”
dark matter’s existence was first inferred
by Swiss American astronomer Fritz Zwicky,
who in 1933 discovered that the mass of all
the stars in the Coma Cluster of galaxies
provided only about 1 percent of the mass
needed to keep the galaxies from escaping
the cluster’s gravitational pull.
The reality of this missing mass remained
in question for decades, until the 1970s when
American astronomers Vera Rubin and W. Kent
Ford confirmed its existence by the observation
of a similar phenomenon.
Dark matter is composed of particles that
do not absorb, reflect, or emit light, so
they cannot be detected by observing electromagnetic
radiation.
Dark matter is material that cannot be seen
directly.
We know that dark matter exists because of
the effect it has on objects that we can observe
directly.
Dark matter may be made of baryonic or non-baryonic
matter.
To hold the elements of the universe together,
dark matter must make up approximately 85%
percent of the universe.
Dark Matter candidates are either baryonic
or non-baryonic, or a mixture of both.
The non-baryonic forms are usually subdivided
into two classes – Hot Dark Matter (HDM)
and Cold Dark Matter (CDM).
Eventually, dark matter found its way to TV
shows like The Flash and the movie called
Dark Matter(2015).
Scientific evidence for dark matter comes
from calculations showing that many galaxies
would fly apart, or that they would not move
as they do, if they did not contain a large
amount of unseen matter.
Well, we have no option but to trust our scientists!
Okay, that’s it for today, folks.
Please subscribe, watch, like, comment…
and enjoy!
Vibrant Violator saying goodbye!
