The celestial body at the center of the solar system is a large ball of gases, mostly made up of helium and hydrogen. the hydrogen in this celestial body undergoes nuclear fusion, thus producing helium.

what is the name of this celestial body?

The name of this celestial body is the sun.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.