It seems like you mean the "tails" of comets.
When a comet's nucleus approaches the sun, the intense heat causes the frozen gases and dust on the surface to vaporize, creating a glowing cloud or coma around the nucleus. This cloud consists mostly of water vapor, along with carbon dioxide, ammonia, and other volatile compounds. The interaction of these gases with sunlight and solar wind creates the characteristic tails of a comet.
The bright glowing gases at the central part of a comet are called the coma. They are produced as the comet comes closer to the sun and the heat causes the ice and other volatile compounds on the comet's surface to sublimate, creating a cloud of gas and dust around the nucleus.
A spinning cloud of gases typically refers to a phenomenon in space where gases, such as hydrogen and helium, are coalescing due to gravitational forces. This process can lead to the formation of stars or planets as the spinning cloud of gases slowly collapses and heats up.
A star.
it is a hot gas
The cloud-like gases from something burning are likely smoke. When a material burns, it releases particles and gases into the air, creating a visible cloud of smoke. It is important to ensure proper ventilation and fire safety measures when dealing with smoke from a fire.
The famous 'Mushroom Cloud' is made by a combination of gases and ash. The gases are sulphur, hydrogen, carbon dioxide, carbon monoxide and many more.
cummulus clouds
A coma
The gases are what glow. The electricity starts to ionize the gas and that's what creates the bright glowing.
"Cloud" in the context of volcanoes typically refers to the plume of ash, gases, and steam that is emitted during volcanic eruptions. This cloud can be hazardous due to the presence of toxic gases and fine ash particles that can pose health risks to people and disrupt air travel.
The moon is bright from the sunlight shining on it, and stars are bright due to the burning of hydrogen and other gases at very high temperatures.