I like DIRECT 2.0 better. 3.0 uses the extremely expensive and over engineered SSMEs, instead of the much cheaper RS68s. I understand about the heat issue, but couldn't they just add a heat shield or something? Alternatively, they could use some smaller boosters instead of the SRBs, since the SRBs are overkill anyway. (Either way, I agree, it's a million times better than Constellation.)

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