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About Lukaszenko

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    Spacecraft Engineer

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  1. Could Super Heavy make orbit with no usable payload? If so, launch it anyway and you end up with something even better. Subtract the fins and legs, and maybe replace a couple engines with vac variants to optimise. You can then take the whole RTLS concept to the next level, where the launch site is low-Earth orbit. I wonder how fast that could get you to Mars?
  2. It did cross my mind, but it can't be that hard to shield 3 cm^3. Besides, since the first sentence of this discussion is "about how humans would survive on long-term space voyage", we'll be using dna storage in one way or another whether we like it or not.
  3. Why not? All sources I checked say that "215 petabytes of data in a single gram of DNA" is 85% of the theoretical limit. Where did you find 455 exabytes ?
  4. "DNA Fountain" method can store 215 petabytes of data in a single gram of DNA. So, looking at the density of DNA, you could easily fit an exabyte into < 3 cm^3.
  5. That has a bit of an ominous quality to it
  6. If that's the case, then maybe there IS a good reason for it after all. They'll probably need all the energy they can get.
  7. I don't think it's fair to count destructive tests during the R&D phase as "failures". Even after the first successes there's a grey zone. Perhaps when they stopped referring to it as "experimental landing" and simply "landing" would be a good starting point to count failures/ successes.
  8. Yeah, they didn't even bother to do the countdown this time.
  9. Given how much effort they put into their PR, I'm guessing that they DO care. Maybe those people aren't directly their customers, but they have an influence on the people who are.
  10. Probably, I didn't realize that they made ropes out of the stuff. Makes sense though.
  11. Based on this link, I estimate a kevlar cable would weigh about 5 kg/m for a 450 ton BFS at 1g. I don't know how much you want, maybe 100 m? So that's 500 kg, and that's probably waaaay over-engineered.