I would rather NASA focus on the SSTO aspects of this instead: https://en.wikipedia.org/wiki/Skylon_%28spacecraft%29 https://en.wikipedia.org/wiki/Skylon_%28sp

I would rather NASA focus on the SSTO aspects of this instead: https://en.wikipedia.org/wiki/Skylon_%28spacecraft%29 https://en.wikipedia.org/wiki/Skylon_%28spacecraft%29