Is there a web version of this? It&#x27;s too bad if all this great information is hidden away in a PDF, which few will bother to open (even on HN, and fewer in the general public) and which  I&#x27;ll probably be unable to find in the future. I found the following website, but my initial impression is that it&#x27;s lacks a lot of the great material in the PDF:<p><a href="http:&#x2F;&#x2F;www.nasa.gov&#x2F;topics&#x2F;journeytomars&#x2F;index.html" rel="nofollow">http:&#x2F;&#x2F;www.nasa.gov&#x2F;topics&#x2F;journeytomars&#x2F;index.html</a>