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Thread: If the suns mass reduces over time by the way exausting its fuel (MASS)

  1. #1 If the suns mass reduces over time by the way exausting its fuel (MASS) 
    SEEKER Genesis's Avatar
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    The reason I ask is, after reading the article futher down the page about, why the earth does not crash into the sun
    and vice versa and the correct answer being, given that the sun bends the earth arround the sun. I wondered
    if the Suns mass reduced as it should surely over time. And the earths mass staying the same would it have a tendency to move away from the sun over time
    ( A greater Orbit) And so. Is it me or has time not changed on Earth ( Longer years = Greater Orbits. or is this wrong is the suns mass would not make a difference.
    If I am being silly please ignore me Thanks


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  3. #2  
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    Yes. The mass of the sun is slowly being reduced, both due to energy loss and because it blows out a lot of mass (the solar wind.) It also gains mass from infalling dust/comets/asteroids etc but it is losing mass faster than it is gaining mass. Eventually this will lead to the Earth orbiting in a wider orbit.


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    Of course,it is important to note just how little mass the Sun has lost in the last 4 billion years or so. it works out to ~.04% of its mass. This is not a lot, and would not have any real significant effect on the length of the Earth's year over that time.
    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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    SEEKER Genesis's Avatar
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    Great answers in both my threads Thanks for that
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    the sun makes heavier and heavier elements starting with helium which then sinks to the core then when hydrogen is all gone the gravity pulls the sun inward causing the helium to become the fuel source then it in turn makes oxygen carbon etc.all falling to core because its a heavier element that is about the shortest way i know how to put it but i hope it helps..so yes loss of mass by coronal mass ejections,and flares and stuff but all stars job is to make all of the element heavier than hydrogen .which more than makes up for lost mas thru coronal mass ejections and normal fusion
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    AI's Have More Fun Bad Robot's Avatar
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    Quote Originally Posted by kreep View Post
    the sun makes heavier and heavier elements starting with helium which then sinks to the core then when hydrogen is all gone the gravity pulls the sun inward causing the helium to become the fuel source then it in turn makes oxygen carbon etc.all falling to core because its a heavier element that is about the shortest way i know how to put it but i hope it helps..so yes loss of mass by coronal mass ejections,and flares and stuff but all stars job is to make all of the element heavier than hydrogen .which more than makes up for lost mas thru coronal mass ejections and normal fusion
    Welcome to the forum kreep. But no there is no making up for the lost mass. The heavier elements that are being made are being made from the lighter elements by combining their protons and neutrons. If you take two hydrogens and make one helium you haven't created any new mass out of nothing. You are simply rearranging the existing subatomic particles that already exist.

    Yes the density of the core will increase but that's not adding to the over all mass of the sun.

    The earths orbit around the sun has a cycle where it becomes more elliptical, about every 35,000 years. I could be wrong about the time frame but essentially as the earth achieves a more elliptical orbit (see diagram below). It's believed that this is one of the causes for triggering ice ages. As you can see from the diagram the earth will be further from the sun for about half the year and this causes more cooling than can be made up for when it's closer to the sun. However, I've not seen any articles talking about the earth getting further from the sun due to lost mass of the sun.

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  8. #7  
    Bullshit Intolerant PhDemon's Avatar
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    Quote Originally Posted by Bad Robot View Post
    If you take two hydrogens and make one helium you haven't created any new mass out of nothing. You are simply rearranging the existing subatomic particles that already exist.
    ...and fusion like this actually leads to a reduction in mass, the difference in mass between the initial and final nuclei being released as energy.
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  9. #8 foot in mouth 
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    well i have to talk and listen to learn ... um working on it..does make sense cause loss of mass by conversion to energy i forgot that Lil part
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