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The [[Earth]]'s [[Sol|Sun]] was made up of 74% hydrogen and 24% [[helium]]. ([[AUDIO]]: ''[[Feast of Fear (audio story)|Feast of Fear]]'') | The [[Earth]]'s [[Sol|Sun]] was made up of 74% hydrogen and 24% [[helium]]. ([[AUDIO]]: ''[[Feast of Fear (audio story)|Feast of Fear]]'') | ||
Hydrogen and [[oxygen]] made up [[H₂O]] | Hydrogen and [[oxygen]] made up [[H₂O]] ([[PROSE]]: ''[[Christmas on a Rational Planet (novel)|Christmas on a Rational Planet]]'') or [[water]]. ([[TV]]: ''[[Arc of Infinity (TV story)|Arc of Infinity]]'') | ||
The [[Fourth Doctor]] suggested energising hydrogen as an alternative power source to the "mineral slime" [[oil]]. ([[TV]]: ''[[Terror of the Zygons (TV story)|Terror of the Zygons]]'') | The [[Fourth Doctor]] suggested energising hydrogen as an alternative power source to the "mineral slime" [[oil]]. ([[TV]]: ''[[Terror of the Zygons (TV story)|Terror of the Zygons]]'') | ||