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Simply Noor

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My question is that how we knew about the mass of Sun?

i was thinking about the rotation of the heavenyl body and friction.

i dint get it that how friction is not affecting the rotation of the planets? and why there is rotation for these bodies for eternity?

for example, why Earth revolve on its own axis?

due to Gravitational Law>..

would any of you pleas help me to know that how we knew that there is mass of Sun?

m i sounding absurd?

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    May 26 2012: Hi Simply.
    The rotation of the earth is slowing down. This is due to the moon pulling on the oceans & causing the tides. It also has the effect of accelerating the moon, which is gradually moving away from us. So our days are getting longer all the time.
    The sun is also getting smaller as it's fuel is used up, not sure about it's mass.
    :-)
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      May 26 2012: Thanks Peter

      what kind of fuel is in there? are we rally sure its fire that is producing heat and light for us?

      if earth is slowing down.....would it stop rotating one day?
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        May 26 2012: It's not the kind of fire you might think of, in the sun it's nuclear fusion of hydrogen atoms which releases so much energy that it produces the light and heat through the electromagnetic spectrum which is the energy released by these particles coming together
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        May 26 2012: Also the Earth won't stop spinning, once the moon orbits earth at the same speed the earth rotates there won't be anything slowing the Earth down anymore, but this takes a few billion years.

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