![]() ![]() In the outer, cooler part of the disk, gases and water ice wereĭominant. The resulting debris may have spread out into Mercury’s outer layer, which would explain why the planet’s core makes Mercury may have experienced a high-speed collision with another planet that stripped off The resulting debris coalesced to form the Moon. Just after this point we think a Mars-sized planet collided with Earth. Solar system’s starting materials-is lower compared to hydrogen, helium Percentage of rocks and metals available in the Universe-and thus our The inner planets didn’t get as big as the outer planets because the Inner solar system for about 100 million years until only four largeīodies remained: Mercury, Venus, Earth, and Mars. Up to hundreds of these worlds collided and combined in the Other volatiles-substances that evaporate at room temperature-toĬondense. Primarily from rocks and metals because it was too warm for water and In the inner, hotter part of the solar disk, the planets grew Protoplanets in less than a million years. This led to more collisions and accretions, forming Moon-sized Kilometer-sized objects big enough to gravitationally attract each Process continued for several thousands of years, forming Growing in just a few years to objects hundreds of meters across. While the infant Sun was still collecting material to start fusing hydrogen, tiny dust particles in the disk around it randomly collided and stuck to each other, Within 500 million years, the Sun separated from its stellar siblings and continued orbiting our galaxy’s center as a lone star. ![]() Will remain so for about 5 billion years. Of energy that countered the Sun’s gravity, stabilizing the young starĪnd keeping it from accumulating more material out of the rotating disk Hydrogen fusion released tremendous amounts Point temperatures and pressures in the core became so intense thatĪnd then there was light. Our baby Sun kept accumulating material for 50 million years, at which Over the next 100,000 years, the cloud collapsed under its own gravity to form hot, dense protostars, one of which was our Sun. Orbited the center of our galaxy, was mostly hydrogen with some heliumĪnd traces of heavier elements forged by prior stars. Itīegan as a gigantic cloud of dust and gas created by leftover supernovaĭebris-the death of other stars created our own. Our solar system formed much later, about 4.6 billion years ago. The Big Bang brought the Universe into existence 13.8 billion yearsĪgo. ![]()
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