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If gravity precedes the formation of a solar system, where did the mass come from that caused the gravity?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)Where does the Solar System end?The defintion of star/planetary/solar systemSolar System formation, considering its and the universe's ageNaming of the planets of the solar systemEjected planets during the early stages of the formation of the Solar SystemWhy are some universal entities round and others are flat?Are the “extinct species” of meteorites originally from the “Barbarian” asteroids?Is the galaxy made of a nebula or the solar system?Are the planets Trappist-1 in the solar system?How is the term “solar system” defined? Could confirmation of a new planet lead to a change in this definition?










2












$begingroup$


In my class we are studying objects in our solar system and this question seemed to just pop up. And since I cannot answer this, I've been really frustrated for quite a while now and would like some help on understanding this.










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    It's not clear what you're asking. What was the actual statement that caused your question? What's the context?
    $endgroup$
    – Florin Andrei
    4 hours ago
















2












$begingroup$


In my class we are studying objects in our solar system and this question seemed to just pop up. And since I cannot answer this, I've been really frustrated for quite a while now and would like some help on understanding this.










share|improve this question







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Lusy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$







  • 1




    $begingroup$
    It's not clear what you're asking. What was the actual statement that caused your question? What's the context?
    $endgroup$
    – Florin Andrei
    4 hours ago














2












2








2





$begingroup$


In my class we are studying objects in our solar system and this question seemed to just pop up. And since I cannot answer this, I've been really frustrated for quite a while now and would like some help on understanding this.










share|improve this question







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Lusy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$




In my class we are studying objects in our solar system and this question seemed to just pop up. And since I cannot answer this, I've been really frustrated for quite a while now and would like some help on understanding this.







solar-system






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asked 4 hours ago









LusyLusy

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Lusy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Lusy is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







  • 1




    $begingroup$
    It's not clear what you're asking. What was the actual statement that caused your question? What's the context?
    $endgroup$
    – Florin Andrei
    4 hours ago













  • 1




    $begingroup$
    It's not clear what you're asking. What was the actual statement that caused your question? What's the context?
    $endgroup$
    – Florin Andrei
    4 hours ago








1




1




$begingroup$
It's not clear what you're asking. What was the actual statement that caused your question? What's the context?
$endgroup$
– Florin Andrei
4 hours ago





$begingroup$
It's not clear what you're asking. What was the actual statement that caused your question? What's the context?
$endgroup$
– Florin Andrei
4 hours ago











1 Answer
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$begingroup$

The start of it all is usually something called a Giant Molecular Cloud, a particular kind of nebula which is denser than usual and cooler than usual. A GMC will typically be 10x to 1000x the mass of the Sun.



That mass is enough to cause the outer layers to fall in on the inner parts and the GMC starts to collapse and shrink. (Diffuse though it is, the mass exerts the same force on the outer edges as it would if the entire mass was concentrated at the center.)



The cloud collapses and frequently fragments into a bunch of smaller collapsing blobs centered on especially dense sections of the cloud. At this point it looks a lot like the Oriion Nebula. The young stars light up and blow away the remaining bits of the GMC, and in the end, you have a cluster of young stars with planetary disks looking something like the Pleiades.



There never was a central mass -- none is needed. The GMC collapses under its own self-attraction.






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    2












    $begingroup$

    The start of it all is usually something called a Giant Molecular Cloud, a particular kind of nebula which is denser than usual and cooler than usual. A GMC will typically be 10x to 1000x the mass of the Sun.



    That mass is enough to cause the outer layers to fall in on the inner parts and the GMC starts to collapse and shrink. (Diffuse though it is, the mass exerts the same force on the outer edges as it would if the entire mass was concentrated at the center.)



    The cloud collapses and frequently fragments into a bunch of smaller collapsing blobs centered on especially dense sections of the cloud. At this point it looks a lot like the Oriion Nebula. The young stars light up and blow away the remaining bits of the GMC, and in the end, you have a cluster of young stars with planetary disks looking something like the Pleiades.



    There never was a central mass -- none is needed. The GMC collapses under its own self-attraction.






    share|improve this answer









    $endgroup$

















      2












      $begingroup$

      The start of it all is usually something called a Giant Molecular Cloud, a particular kind of nebula which is denser than usual and cooler than usual. A GMC will typically be 10x to 1000x the mass of the Sun.



      That mass is enough to cause the outer layers to fall in on the inner parts and the GMC starts to collapse and shrink. (Diffuse though it is, the mass exerts the same force on the outer edges as it would if the entire mass was concentrated at the center.)



      The cloud collapses and frequently fragments into a bunch of smaller collapsing blobs centered on especially dense sections of the cloud. At this point it looks a lot like the Oriion Nebula. The young stars light up and blow away the remaining bits of the GMC, and in the end, you have a cluster of young stars with planetary disks looking something like the Pleiades.



      There never was a central mass -- none is needed. The GMC collapses under its own self-attraction.






      share|improve this answer









      $endgroup$















        2












        2








        2





        $begingroup$

        The start of it all is usually something called a Giant Molecular Cloud, a particular kind of nebula which is denser than usual and cooler than usual. A GMC will typically be 10x to 1000x the mass of the Sun.



        That mass is enough to cause the outer layers to fall in on the inner parts and the GMC starts to collapse and shrink. (Diffuse though it is, the mass exerts the same force on the outer edges as it would if the entire mass was concentrated at the center.)



        The cloud collapses and frequently fragments into a bunch of smaller collapsing blobs centered on especially dense sections of the cloud. At this point it looks a lot like the Oriion Nebula. The young stars light up and blow away the remaining bits of the GMC, and in the end, you have a cluster of young stars with planetary disks looking something like the Pleiades.



        There never was a central mass -- none is needed. The GMC collapses under its own self-attraction.






        share|improve this answer









        $endgroup$



        The start of it all is usually something called a Giant Molecular Cloud, a particular kind of nebula which is denser than usual and cooler than usual. A GMC will typically be 10x to 1000x the mass of the Sun.



        That mass is enough to cause the outer layers to fall in on the inner parts and the GMC starts to collapse and shrink. (Diffuse though it is, the mass exerts the same force on the outer edges as it would if the entire mass was concentrated at the center.)



        The cloud collapses and frequently fragments into a bunch of smaller collapsing blobs centered on especially dense sections of the cloud. At this point it looks a lot like the Oriion Nebula. The young stars light up and blow away the remaining bits of the GMC, and in the end, you have a cluster of young stars with planetary disks looking something like the Pleiades.



        There never was a central mass -- none is needed. The GMC collapses under its own self-attraction.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 3 hours ago









        Mark OlsonMark Olson

        5,8681020




        5,8681020




















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