Buy here: Red Sox Nasa logo shirt
Source: Red Sox Nasa logo shirt
Source: Red Sox Nasa logo shirt
In short, the propellant used by NASA missiles can penetrate into the Red Sox Nasa logo shirt metal. Because the gas molecules are very small. It means that over time, gas will leak out of the tank. With Methane it’s not a problem because the gas molecules are much bigger. SpaceX chose Methane for two reasons (possibly more) 1) that gas could be made from Carbon Dioxide from the Martian atmosphere, in electrolysis form and 2) because it could be stored in tanks metal for a longer time.
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