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For anyone interested in this topic/NASA, etc, and doesn't mind using Quora, I suggest reading the answers of https://www.quora.com/profile/Robert-Frost-1 https

For anyone interested in this topic/NASA, etc, and doesn't mind using Quora, I suggest reading the answers of https://www.quora.com/profile/Robert-Frost-1 https://www.quora.com/profile/Robert-Frost-1. He's a treasure trove of information and clearly passionate about the topic.

reagan83 11y ago
Off topic: but why would someone mind using Quora? IMHO it's a great service, but open to hearing opinions on it.
- praneshp 11y ago
  Hey reagan83, sorry, just saw this comment. I've seen some hate on HN for quora due to their walled services, you need to login (with your real name).