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Nebula and star formation

  1. Mar 24, 2014 #1
    Would you expect to find stars being made more easily in a cool, high-dense nebula or conversely a hot, high-dense nebula? Looking at for example the pillars of creation which is a stellar nursery, but what would be classified as hot and cold? relatively speaking. thoughts? thanks pf!
     
  2. jcsd
  3. Mar 25, 2014 #2
    Cold nebula. It is far easier for gravity to do its thing when the gases are cool. I am not sure of the temperatures off the top of my head.


    Damo
     
  4. Mar 25, 2014 #3
    On the other hand, if the cloud is hot, it is gonna take less time for the star to ignite because it already has some temperature. However, I don't think that temperature wold be significant.

    cb
     
  5. Mar 25, 2014 #4

    D H

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    Staff: Mentor

    Temperature is very significant. Stars don't form from hot clouds. They form from cold molecular clouds, with temperatures less than 20K or so.
     
  6. Mar 25, 2014 #5
    How can a temperature of only 20K be significant? How can it disturb the formation of a star? Just wondering?

    thanks, cb
     
  7. Mar 25, 2014 #6

    Drakkith

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    Staff: Mentor

    Hotter clouds resist gravity since the temperature determines the outward pressure the gas will have. During the initial collapse of the cloud, when it is still a long way off from forming a star, it needs to be very cold in order for gravity to bring it together. Remember that the density of these gas clouds is still very very low, as is the gravitational force the cloud exerts on itself.
     
  8. Mar 26, 2014 #7
    Okay so cool/dense cloud for the star, but when you have proto-star forming and the gas around it is heating up...would that hot gas/dense then be more beneficial for proto-planet development?
     
  9. Mar 26, 2014 #8

    Drakkith

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    Staff: Mentor

    I think that depends on what you mean by "beneficial".
     
  10. Mar 31, 2014 #9
    your right that is relative drakkith
     
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