Dark Matter is theorized to be large part of every single Galaxy in the Universe. Because of Centrifugal force, the angular momentum of Galaxies is much to high to sustain the amount of matter that Galaxies contain. They would literally spin them selves apart. Dark Matter cannot be observed directly but we know its their because we see its effect in every Galaxy in the sky.

Further Thoughts

Dark Matter probably originates from another dimension that we as humans are not a part of, but somehow effects mass on large scales. It is theorized that their are about 26 dimensions and we are only part of 4 of them. It is also said that all 26 dimensions intersect in the 3rd dimension which is space. We also believe this is where Gravity and the other forces of the universe originate from. At the few seconds after the big bang many of these dimensions where compressed together which is why all 4 forces where a single force called the super force. These four forces are the Strong and Weak Nuclear Forces, Gravity, and electromagnetism. At very high temperature these forces where of a single force and as the universe expanded and cooled they split. This was the birth of all 26 dimensions. I believe that because the entire universe was contained inside a singularity. This singularity contained all 26 dimensions in a single plane of existence which is how so much matter and energy could be contained in a space the size of a few microns across.

Radio telescope, usually a microwave dish with a movable parabolic reflector.

Because light travels at a finite speed, we see very distant galaxies not as they are now, but as they were millions to billions of years ago. Several billion years ago, there univese was more crowded than it is now, and galaxy collisions were more frequent, leading to the growth of large galaxies with massive black holes capable of producing quasars. The distruption caused by a galactic collision would send matter towad the black hole , triggering a feeding phase that would result in the formation of a quasar. Now the universe is less crowded and such collisions occur far less frequently.

That they are receding at more than 90% the speed of light, and that they are not stars in our galaxy because we can't see change.

Quasar actually means quasi-stellar radio sources so we thought that it was giving off radio waves but we did not put into account the redshift that causes the stretching of the wavelength meaning that it most likely gives off microwaves.

There are more quasars in faraway galaxies, i.e., in the distant past.

There are more quasars in faraway galaxies, i.e., in the distant past.

There are more quasars in faraway galaxies, i.e., in the distant past.

There are more quasars in faraway galaxies, i.e., in the distant past.

Quasars are some of the most distant and luminous bodies we can observe. Since we measure them to be incredibly far from our own galaxy, in the order of billions of light-years, astronomers believe that they are several billions of years old as their light would have taken that long to travel to us. Astronomers think that they may be young galaxies as the appear to be incredibly bright balls of accreting gas that probably have black holes at their cores. Because quasars give off characteristic pulses of light at regular intervals, astronomers use them as "standard candles" to measure the redshifts (how quickly they are moving away from us) of other extremely distant objects.