The Earth and the Sun -Hydrogen (about 70%) is the Sun’s main fuel source -Helium (about 25%) and energy are the main products of fusion from the Sun -there are other elements too, but these are not from fusion in the Sun itself but, according to scientists, from traces of other stars that came before the Sun
The Earth and the Sun -The sun is predicted to last for 10 billion years based on its mass and the life cycle of other stars -this is based on radioactive dating of other stars of similar origin in time and by calculating how much “energy” is left in the Sun
Energy Content (MJ/kg) The Earth and the Sun -Based on the amount of energy coming from the Sun, the only process that could allow for this is fusion -chemical energy is not sufficient to produce the same amount of energy for such long periods of time Fuel Type Energy Content (MJ/kg) Wood 15 Sugar 17 Coal 23-29 Gasoline 45 Methane 55 Nuclear Fission (U) 90,000 Nuclear Fusion (H) 300,000
Fission vs. Fusion Compare and contrast fission and fusion. Fission