smelly gas
coma
The tail. This is comprised of whatever the comet was made of, but is now being burnt off by the sun. ( the tail of a comet always points away from the sun.)
Nebula
http://en.wikipedia.org/wiki/Nebula
cirrus
nebulea
An atmosphere implies the presence of a gaseous substance (such as air, in the earth's atmosphere, which is primarily made up of nitrogen and oxygen). Space is defined as the absence of atmosphere (as pure space consists of no solid, liquid or gaseous substance).
cloud is like a fog , and a sky is space full of air and the ozone layer
a cloud of glowing gas and dust is called a nebula
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I have found on merapakistan.com that a cloud is formed due to evaporation and it moves here and there and when it colds down it rains and Sky is a something blue which when we see upward in the absence of clouds and it is high far beyond the imagination and scientists have contradictions on what it is.
A nebula is an interstellar cloud of dust, hydrogen gas and plasma. It is the first stage of a star's cycle.
It is a nebula.
This an electron cloud.
star
The electron cloud is a volume of space around an atomic nucleus. It comprises of a space of probability. It is the volume of space where electrons can "probably" be found, or have a probability of being found.
electron cloud
it is a nebula
The space around the nucleus of an atom is called the electron cloud. The electron cloud is the space in which the electrons of that atom travel. Compared to the nucleus, the electron cloud is enormous.
Magellanic Clouds .
We understand that the electron is the particle that is found in what is called the electron cloud around the nucleus of an atom.
A nebula is a large, indistinctly defined body in space, like a gas cloud or cloud of small particles.
Nebula