cortex
A Nucleus
Yes, cell bodies are found there. Gray matter is cell bodies; white matter is myelinated axons.
Like all lobes of the cerebral cortex (the bumps and grooves of brain tissue that constitute the outside of the brain), the occipital lobe is made up of neuron cell bodies (gray matter) and the clusters of fibers that allow neurons to send chemical signals to other neurons (axons, or, white matter). The neurons in the occipital lobe are tightly packed and arranged in columns.
Theoretically it is known as the word mass .That is the best answer.
All of the cerebral cortex is gray matter as it composed of neuronal cell bodies which are not insulated with myelin.
A Nucleus
All bodies: from Supergiant stars like Deneb or Betelgeuse, galaxies, galactic clusters, and super clusters, to molecules, atoms, baryons and mesons, and quarks. All forms of matter are part of the universe.Furthermore, since mass and energy are equivalent and matter-antimatter pairs can appear spontaneously (though usually fleetingly), even energy can be considered as a "body" that makes up the universe.
White matter
gray matter is a central butterfly-shaped area composed of masses of short nerve fibers, inter-neurons, and motor neuron cell bodies.
True
Probably not. Dark matter is not believed to concentrate well in or around masses the size of stars. But it does concentrate well around galaxies and clusters of galaxies. Most of the mass of a galaxy like ours is believed to be in a sphere of dark matter in the galaxy's spherical halo.
Air, like all matter, is attracted to other matter. The bigger the "other matter" the stronger the attraction. Because of this, matter (including air) tends to clump together into masses (planets, stars). This process inevitably leaves gaps in-between these masses that don't contain any matter. Collectively, these airless gaps are referred to as "space" or "the vacuum".
That is a very good question. Gray matter is composed of cell bodies of neurons. Such cell bodies are also covered by myalin sheath. But the colour of myalin sheath is dominated by the color of nerve cell bodies. ( Without the myelin sheath, there will be short circuit.)
what is the bodies of matter
is an objects density the measure of the amount of matter in the object compared to known masses
Galaxies are held together by gravity. So are Solar Systems. In the case of galaxies, and galaxy clusters, it isn't entirely clear what type of masses provide this gravity - the amount of known matter is simply too small, by a factor of 5-10. For more information, do some reading on "dark matter".
largely or entirely composed of nerve fibers and contain few or no neuronal cell bodies or dendrites.