Anonymous asked in Science & MathematicsAstronomy & Space · 3 months ago

How does a lot of hydrogen just get together randomly and form a sun?


Same for a bunch of dust forming planets and moons?

I'm not trying to make a religious point here, I'm just curious.

21 Answers

  • 2 months ago

    Since space is a vacuum a cloud of gas is just floating in there. A slight disturbance (a far supernova) that disturbs it a little bit can be enough to create a pocket where is a little bit more gas than elsewhere. The tiny amount of a little bit of gravity this pocket has more than the rest of the gas will attract those gasses around it. So, then more gas will collect at the same place, the thing gets heavier and heavier and draws even more gas. This process starts very slowly but once it started it will not stop until the supply of gas ends. Planets form the same way, but on a smaller scale. So once the pressure and heat inside this gas bubble has been raised to a certain temperature nuclear fusion will happen and a star has been born. Actually a quite simple process.

  • 3 months ago

    Current scientific opinion holds that dust particles were drawn together by electrostatic forces to form larger particles.  Once the mass of the larger particles reached a critical size, gravity took over to eventually form stars and planets and moons. 

  • Manuel
    Lv 4
    3 months ago

    Gravity, electro-static charge and gravity, plus a lot of time.

  • 3 months ago

    Well it's different processes at different scales, but the basic idea is that initially small density fluctuations were pulled together by gravity. Formation of galaxy clusters seems to be helped along by dark matter, stars by the cooling of gas clouds, and planets by dust accretion.

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  • 3 months ago

    Gravity and electrostatic attraction will begin the process;  as the tiny bits and chunks attract more, the gravity increases, and pulls in more mass from the cloud. 

  • ANDY
    Lv 5
    3 months ago

    It takes a lot of time for a nebula in order to form a dense zone of protons (hydrogen). Gravity would then increase enormously in a short time if a supernova takes place next to this nebula, thus  compressing the gas and augmenting the heat. This will reach a certain temperature and pressure where protons, positively charged, will not repel anymore but fuse (usually 15 million degrees). The fusion reactions will eventually give off energy and radiation when a helium nucleus is achieved. This energy is the outcome of what is called "mass defect", which is a loss of mass of 0.7% as regards to the original 4 protons that developed the helium nucleus.

    So as you see, it is not really a random get together as you say. It takes discrete amounts and movements to obtain a star.

  • Clive
    Lv 7
    3 months ago

    Gravity, that's all.  Even if it's all evenly spread, if it's free to move, there will become denser areas of gas, and their gravity will pull more towards them... so the gas clumps together, heats up and becomes stars.

    Gas and dust will tend to not move straight in to these clumps because it's already moving in its own direction, so unless that direction just happens to be directly toward a clump, it will spiral in and you get a spinning cloud where a star is forming in the middle.  Smaller clumps will also form further out in the cloud and they become planets and other objects.

    What does religion have to do with it?

  • D g
    Lv 7
    3 months ago

    the suns are created  when a spinning  disk of gas gets a small group of atoms of hydrogen 

    the few atoms of hydrogen  ACTUALLY have gravity 

    say its  4 atoms of hydrogen

    the 4  collect a fifth

    then the five collect a sixth 

    and then six  collect a seventh

    this continues   and then groups can attract groups 

    so   the  seven  could attract a collection of  3 hydrogen

    this continues untill there is enough hydrogen to produce pressure to  fuse the two hydrogen 

    there are also  hydrogen  that is not  grabbed by the sun  .. such  hydrogen forms the outer planets  

  • Sky
    Lv 7
    3 months ago

    Gravity.  It's nothing more than gravity bringing it all together, and the crushing pressure when there's enough of it causes it to heat up to the point of nuclear fusion.  This is basic grade school level science.

  • Gravity + time = Condensing cloud of gas

    As gas condenses, pressure increases.  As the pressure increases, the temperature increases.  As the temperature increases, so does the kinetic energy of the gas.  Eventually, the velocity of the particles is high enough to overcome their magnetic repulsion and fusion happens.  And then that's all she wrote, because now you have a star.

    Nothing mystical, nothing magical, nothing unbelievable.  The general concepts are pretty straightforward physics that you can learn in high school.

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