The "coma".
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The hazy cloud surrounding the center of a comet is called the coma.
The "coma".
The hazy patch surrounding the nucleus of a comet is called the coma. It is composed of dust, gas, and water vapor that have been released from the nucleus as it is heated by the Sun. The coma can extend for thousands of kilometers around the nucleus.
A comet's head is called the nucleus. This is a solid core made up of ice, dust, and rocky materials. When a comet gets closer to the Sun, the nucleus starts to heat up and release gas and dust, forming a glowing coma and tail.
The Milky Way appears as a hazy band of stars in the sky because we are viewing it edge-on from within the galaxy. The combined light of billions of distant stars, interstellar gas, and dust within the plane of the galaxy creates this band of light across the night sky.
There are three in our solar system which are blu or bluish. the most blue is Neptune because of the methane absorbing the red light. Uranus in more of a Cyan in colour and Earth is a mixture of blue, green and white.