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The cause of planets is that when the sun was formed ancient stars thousands of years ago sun made the planets by using rock ro make the mantel,core,atmosphere

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The cause of the planets forming was the cloud of dust and gas (Nebula) having a star (sun) that Sun's gravity pulling bits of rock, dust, ice, and gas.

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They were formed by the pressure of hydrogen at the center of the sun then hydrogen. That release energy which is called sunlight. So that's what created the planet's.

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It is formed by the solar system and the space cloud called nebula which is made up of bits of space dust ,rocks,ice,and gases.

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The cause of the planets forming.Are

made from bits of rocks ,dust,ice,gas

and then clump up and that's the cause.

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The cause of planets forming was when nebula and ancient stars pulling bits of rock, dust, and gas.

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The cause of planets forming was the suns gravity pulling bits little by little of ice, dust,rock, and gas.

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The plants where made by the suns left over pice slowly the prices came to geth Wich formd the plants that we know today Earth,Venus and the rest of the plants.

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A space cloud called the nebula made of many materials formed a small star not ready to give light.It was our Sun and as years passed it turned into the sun we know.The Suns gravity pulled together those particles making clumps which we call the planets.

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The cause of the planets forming was that the nebula orbited the sun and the sun formed the planets by pulling some rocks, dust, and gas to make the planets

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The cause was that a very long time ago our universe was just a big space cloud which was called a nebula. In the center of the nebula was a star that started to get bigger over time and release light and became our sun. That sun started pulling bits of rock until those bits of rocks became the planets that we know today.

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The sun rapped up the dust ice and rock with its massive and strong gravity tugging and creating clumps of rock and gases. These then became Mecury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto who is not know as a planet anymore

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planets that are made of gas are more stronger like earth,Venus,mercury,mars have gases but the outer planets have light atmosphere to hold heavy stuff like water and people but like the gas giants have very light air like helium that does not support people and living things

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Some planets are made up of rock and gas because the planets that were closer to the sun were rocky and the planets farther from the sun have gas and are gas planets.

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It's because the closer planets atmospheres get blown away by the Sun's energy,but the outer planets are cold so their atmosphere stays with them.

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The inner planets are rocky because they were closer to the sun which burned away gases making more rocky surfaces then gas. While the outer planets were farther away so they kept their gases surrounding the planet.

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IT happens because when the sun heart blasted gas and leaving behind spheres of matter with only a little gas left.

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The reason why some planets were made of rock and the others were made of gas is because the inner planets that are closest to the sun had gases but the Sun's heat blasted away that gas. Unlike the outer planets they are more far away which meant they were more cooler so their gasses stayed in place.

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Because some planets were closer to the sun and most of them were made out of rock but half of them were made out of gases and about on how far they can go.

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a iner plant is formd by rock made from the minerals from the sun.but the outer plants are made of gas because there fare away from the sun.

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The sun's heat blasted away the gas leaving solid spheres of matter, which made the inner planets. The sun's heat was cooler on the outer end which is why the gas stayed there and the gas planets have more thick layers of gas.

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The reason why because the closer that most planets get atmosphere gets blown away by the sun .

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After they discovered that they wondered if charon was a planet to and if there was any other planets out there. And because they also thought that pluto might be to small but, after looking at the charon planet they started to wonder.

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They began to think if Pluto is to small to be a planet, and if there were other things the size of Pluto are they considered planets.

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Astronomers were surprised that Charon was the half the size of because that made think they should make Pluto a dwarf planet

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astronomers realized that there mite be other plants that are like pludo that no one have seen .

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The astronomers were thinking if Pluto was a planet or if there were other objects like Pluto. they also asked if Pluto had been to small to be a planet.

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What happened was astronomers realized that Pluto was smaller then they had originally thought. They also wondered if Charon could or was a planet.

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When they discovered Charon was half the size of Pluto they started to ask each other questions like " is Pluto too small to be a planet? They also started to think where there more object the size of Pluto.

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They wondered if Pluto was a planet or not a planet and they realized that Charon was half the size of Pluto

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They took Charon and said that is not Plutos's moon anymore and they also noticed that Pluto got a lot smaller

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When they discovered that Charon was half

the size of Pluto then they realized

that Pluto is way smaller then they predicted.

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The started to realized that Pluto was even smaller the they thought and Pluto's moon (Charon) was half the size as Pluto. After that discover they wondered if there are other objects the same size of Pluto and if Charon could be a planet could be planets!

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Scientists started to argue what a planet is and if Pluto and Eris should be considered planets or not.Since they didn't know what to do they created a definition and criteria for something to be a planet.

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Mike browns discovery on Eris was that it was to big and too bright people were areguing if the solar system gained its 10 planet

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What happened was that they had revealed that there may be a tenth planet but people argued what was a planet.

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the result of discovering Eris led to an argument across the world. When they found Eris we thought it would be our tenth planet but others disagreed which led to the argument, but then the argument went down on a question, what is a planet?

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After scientists discovered Eris they started to ask questions like " if Eris and Pluto should be a planet or not a planet.

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The result was that astronomers started arguing about it not being a planet, and scientists started thinking about one main question "what is a planet" and what is the definition of a planet.

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Eris was a big find but brown and his team called it the 10 planet but others disagreed and then people noticed the biggest question. What is a planet?

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When Mike brown discovered Eris

after they revealed what they have found

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The result was when he looked on his computer and looked at the planets they were no planets it was caused by a kind of flaw in the telescope's camera and after a little bit they discovered xana.

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They think that the definition of a planet will change because a our universe will keep changing over time and we will discover new exciting things and maybe new planets will form as well.

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Astronomers think the definition will change by new planets forming around new stars making a new solar system.

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The astronomers think the definition of a planet will change because science continuously changes when new information is discovered.

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A planet like Pluto could because planets could form overtime like Pluto because it could become a ice giant because it could form rocks to be a huge planet

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They think that because science continually changes and we thought the world was geocentric,that there were originally 6 planets,and Pluto was connected to Charon.

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I think some astronomers think the definition of a planet will change because they asked if there are other planets out their that are like earth, they also questioned if there could be life on there moons.

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The definition of a planet will probably change in the future because we are learning more about our solar system and our milky way which will change our thoughts about our planet. I think it will change because we have lots more to explore and almost infinite ways to improve to see the universe we are in.

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I think t will change a little bit because Pluto might grow or Mercury might shrink.

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They think that because continually changes as new information is discovered and they used to think that there were six planets and then eight and nine but now eight

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Some astronomers think that planets will

change in the future because it change before and maybe happen again.