GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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arranged in arms encircling a dense center.
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all packed into a spherical, dense center.
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arranged in the shape of a flattened ball.
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and gases arranged in no specific shape.
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Detailed explanation-1: -The gas and dust in the arms filter out all but the blue light from stars in the arms. Stars are forming in the spiral arms so there are many more high mass, hot, blue stars. Almost all the stars of the disk are in the arms of the galaxy and their light makes it appear blue.
Detailed explanation-2: -Spiral galaxies look like giant pinwheels. The arms of the pinwheel are made up of stars and lots of gas and dust. Gas and dust are some of the main ingredients needed to form new stars. Young stars burn much hotter than older stars, so spiral galaxies are often some of the brightest in the universe.
Detailed explanation-3: -A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.