1.   Controllers ordered a shutdown of the errant fuel cell, which combines supercold liquid hydrogen and liquid oxygen to make electricity and water.

2.   The devices combine supercold liquid hydrogen and liquid oxygen to generate electrical power.

3.   The insulation is critical to ensure that ice does not form on the tank after supercold liquid hydrogen and oxygen fuels are loaded.

4.   These devices generate electrical power and produce drinking water by combining supercold liquid hydrogen and liquid oxygen reactants.

5.   They found minuscule cracks in the metal liner of fuel lines that carry supercold hydrogen to the main rocket engines.