UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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About 4.6 billion years ago, a cloud of stellar dust or nebula exists within the Milky Way.
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About 4.5 billion years ago pieces of rock and ice accumulate more material until they grow into planets and moons.
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The SUN is born, fusion begins in the core.
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None of the above
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Detailed explanation-1: -According to the planetesimal hypothesis, when a planetary system is forming, there is a protoplanetary disk with materials from the nebulae from which the system came. This material is gradually pulled together by gravity to form small chunks. These chunks get larger and larger until they form planetesimals.
Detailed explanation-2: -Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin. As the gas spins faster, it heats up and becomes as a protostar. Eventually the temperature reaches 15, 000, 000 degrees and nuclear fusion occurs in the cloud’s core.
Detailed explanation-3: -The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems). It suggests the Solar System is formed from gas and dust orbiting the Sun which clumped up together to form the planets.