From an accretion disk of dust and gas orbiting the newly born sun. The solar wind and light from the newly formed sun blew most of the gas towards the outer solar system, which is why the outer planets are gigantic and made mostly of gas while the inner planets are made of rock.
2007-03-20 14:06:51
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answer #1
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answered by Roman Soldier 5
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Our solar system formed along with our sun. Our sun formed when a giant molecular cloud, hundreds of light years across, condensed and collapsed under its own gravity. Dense areas in this cloud, over hundreds of millions of years, started to form stars. This type of "stellar nursery" is typical and is evident throughout our galaxy. The Pleiades are new stars that still have wisps of the molecular cloud they formed in. The Orion Nebula is a great stellar nursery, visible to the naked eye in Orion's "sword." It is theorized that our sun's particular molecular cloud was located in the area of the constellation Ursa Major; that our sun was part of the star cluster of the Big Dipper.
A new sun is shrouded in the stuff that it comes from, mostly hydrogen, helium, and of course the heavier metals that will eventually make up the rocky inner planets like our earth. This shroud is referred to as a "planetary nebula." Many examples of planetary nebulae can be seen with the Hubble space telescope.
About 5 billion years ago, the little bits of dust and minerals in the planetary nebula surrounding our new sun started clumping together through magnetic and gravitational attraction. In a case of where the rich get richer, the bigger clumps of rocks attracted even more debris and grew. These little rocks, over a relatively short time span of 100,000 years, grew into small planetissimals. Those that collided with others either got absorbed or absorbed more material and grew into plantery-sized objects. The bombardment continued. At some point a large planet-sized object collided with what would be eventually be Earth, and from that collision two objects were produced, the Earth and the Moon. The heat from that collision kept things pretty much molten, but eventually the Earth and Moon settled down in their respective orbits and started to cool, from the outside inwards. Cratering continued for a time. At some point, about 4 billion years ago, the sun, in a giant burst of energy known as the T-Tauri wind, cleaned house and blew the remaining debris out beyond Pluto's orbit, which would become the Kuiper Belt and Oort Cloud, from whence come our comets. The outer planets, Jupiter, Saturn, Uranus and Neptune collected much of the gases of the nascent planetary nebula, to become gas giants.
Saturn tore apart an orbiting moon that got too close and developed an amazing ring system. The tidal forces of Jupiter apparently also crushed another large body, giving us our asteroid belt.
Things have quieted down a lot since our early beginnings, and the sun is now in the middle phase of its life.
2007-03-20 22:33:07
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answer #2
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answered by Anonymous
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In the beginning, God created the heavens and the earth. The Earth was without form and was empty.
Likely, He did it by letting cosmic dusts collect together by the gravity forces that He invented, and which we still have today. As these dusts collected in great cloud, they compacted to spheres, as His laws of nature would predict and they cooled and solidified in the smaller masses, like the earth. Gasses floated out of the masses and where there were great masses they ignited to form stars, like the sun.
2007-03-20 21:12:23
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answer #3
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answered by Anonymous
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The Big Bang Theory?
2007-03-20 22:38:11
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answer #4
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answered by =] 5
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around 5 billions year ago,a giant gas cloud was turning.It was the accretion disc,probably an explosion of a supernova
caused it to contract .The temperature and density at the middle became so great that it ignited thermonuclear reactions and the sun was born.Some of the debris not attracted directly by the sun orbited around it.after billions of collisions the planets were formed.
2007-03-21 15:53:37
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answer #5
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answered by najj 2
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our solar system was made by gravity, clumps of debris gathered into eight monopolies: our planets. Simple physics,
2007-03-20 22:25:07
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answer #6
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answered by Adam B 2
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they say that the big bang started the universe
2007-03-20 21:07:27
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answer #7
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answered by Kira Uchiha 2
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its gravity not god
2007-03-20 21:05:53
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answer #8
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answered by Anonymous
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God
2007-03-20 21:04:14
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answer #9
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answered by Priss 1
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