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Vaelroth
2006-Sep-25, 05:41 PM
I was wondering what the projected lifespan of Sol is, and about how long it has before it changes phase to a different type of star. I tried searching for it, but kept getting an error (I think it was from too many results).

korjik
2006-Sep-25, 05:57 PM
total is about 9 billion years. The sun is middle aged at about 4.5 billion.

antoniseb
2006-Sep-25, 06:01 PM
You can calculate it roughly by knowing that the Sun radiates about 4x1033 ergs per second. Then calculate how long it would take to use up a tenth of a solar mass (a tenth of 2x1033 grams) of Hydrogen converting it to Helium, knowing that each gram of Hydrogen produces 0.993 grams of Helium, and 0.007 grams of energy.

You should get a value around 10 billion years. Please note that there is a little uncertainty about what fraction of the Sun can get consumed in the process.

Vaelroth
2006-Sep-25, 06:04 PM
Thank you guys! That was all I needed. Thank you very much antoniseb for the formula.

Laguna
2006-Sep-25, 07:59 PM
I was wondering what the projected lifespan of Sol is,

Where is that project description? I had it somewhere here...
The technical details are in it, I remember that.
Sol, Sol, Sol, must be somwhere in this bookshelf. That's an old project, must be under all that stuff in here. Ahhh, must clean up here first.

I will tell you, when I found it. :D

George
2006-Sep-25, 11:45 PM
... about how long it has before it changes phase to a different type of star.
We should see it go from a yellow star to a white star in only a year or so. :D