UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a few million years ago.
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about 10 million years ago.
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hundreds of millions of years ago.
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billions of years ago.
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at the beginning of the universe.
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Detailed explanation-1: -The Sun and the planets formed together, 4.6 billion years ago, from a cloud of gas and dust called the solar nebula. A shock wave from a nearby supernova explosion probably initiated the collapse of the solar nebula.
Detailed explanation-2: -Most stars in our part of the Galaxy are formed: in open clusters of a few dozen.
Detailed explanation-3: -Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
Detailed explanation-4: -The Sun will keep expanding in size and luminosity, becoming a red giant star. Its radius will reach 100 times its present size, so that the planet Mercury will be engulfed and vaporized.