#### Transcript Potential Life expectancy of the Sun using energy generated by

```How Fuelish is the Sun?
What fuels the sun
Life Expectancy of Sun ?
What if the source of the Sun’s energy was
the combustion of coal? (carbon)
C + O2
1 ton + 2.5 tons
CO2
3.5 tons
1.6 x 1016 tons/sec of coal
needed to account for the
Sun’s energy output.
Mass of Sun = 4.5 x 1026 tons
Potential Life expectancy of the Sun using
energy generated by combustion of Coal.
Mass of Sun
4.5 x 1026 tons
---------------------- = ----------------------- = 2.8125 x 1010 seconds
Combustion/sec 1.6 x 1016 tons/sec
2.8125 x 1010 seconds
------------------------------- = 0.886 x 103 years
3.16 x 107 sec/year
Sun would only last 886 years…….
Unfortunately …..
CO2 would smother the reaction !!
Coal-Computation
Life Expectancy of Sun ?
What if the source of the Sun’s energy was
the Fusion of Hydrogen into Helium?
4H
4(1.0079)
He + energy (matter converted to energy)
4.003 + (4.0316 – 4.003= 0.0286 mass units converted to energy)
600 x 106 tons/sec tons of Hydrogen
needed to account for the
Sun’s energy output.
Mass of Sun = 4.5 x 1026 tons
Potential Life expectancy of the Sun using
energy generated by Fusion of H into He.
Mass of Sun
4.5 x 1026 tons
------------------------- = ----------------------- = 7.5 x 1017 seconds
Energy from fusion/sec
600 x 106 tons/sec
7.5 x 1017 seconds
------------------------------- = 2.37 x 1010 years
3.16 x 107 sec/year
Sun has enough H for 23,700,000,000 years
From what astronomers have observed ….
Stars like our Sun build a core of Helium that
stops the fusion of Hydrogen after about 10
billion years causing the star to expand into a
Red Giant that will envelope the Earth.
Fusion-Computation
That will happen about 5 billion years
from now …. Be prepared to MOVE!
```