GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is true about the characteristics of a galaxy?
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Elliptical galaxies range in diameter from 3, 300 light to 490, 000 light years
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Spiral galaxies range from 16, 000 light years to 160, 000 light years
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Irregular galaxies are between 7, 000 light years and 34, 000 light years in diameter
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The mass of a galaxy is generally between 1 million and 1 trillion times the mass of the sun.
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Many galaxies are thought to have supermassive black holes at their centers.
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Explanation:
Detailed explanation-1: -They may have been created by the gravitational collapse of giant gas clouds from which galaxies were formed, or from the merger of many smaller black holes over time. Another possibility is that one simply grew over billions of years by steadily devouring orbiting stars.
Detailed explanation-2: -Modern astronomers believe that most galaxies, including our own Milky Way, have supermassive black holes at their hearts. They are called supermassive because they contain millions or billions of times the mass of our sun.
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