"The only constant is change and it is a variable"™
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If space is the future, sending a few people on the top of a burning Hydrogen+Oxygen rocket engine is expensive and dangerous.
We are proposing using the same Hydrogen+Oxygen paradigm to make something that is not as expensive, but still very dangerous.
Hydrogen for lift (balloon), Oxygen + Hydrogen for boost and the empty shell for a solar sail.
Even if we can only lift small weights out of the atmosphere, the cost would be significantly less than a rocket designed for warfare and modified for travel.