<div class="gmail_quote">On Thu, Mar 19, 2009 at 11:51 PM, Keith Henson <span dir="ltr"><<a href="mailto:hkeithhenson@gmail.com">hkeithhenson@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
How do you propose to prevent fission neutrons from making vaporized<br>
rock radioactive?</blockquote><div><br>I don't, actually. :-)<br><br>I just wonder whether the relevant increase in radioactivity could ever be a match for the "billion of deaths" preconised by GW and oil-peak prophecies...<br>
</div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">
</div>Please explain the orbital mechanics of going from a nuclear powered<br>
cannon launch to GEO. Earth escape I can see, but how do you propose<br>
to match with GEO?</blockquote><div><br>Orion Project does not have anything to do with a "cannon". For all practical aspects, it is a pulse rocket like the V1, if I am not mistaken, albeit an unconventional and large-scale one. See, e.g., <a href="http://en.wikipedia.org/wiki/Project_Orion_%28nuclear_propulsion%29">http://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion)<br>
</a><br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">How do hydrogen burning rockets contribute to carbon emissions?<br>
</blockquote></div><br>In fact, as I said, only *very* marginally, by burning the environmental carbon close to the launch area into CO2. More or less as a military nuclear bomb does. <br><br>OTOH, isn't the "nuclear winter" effect supposed to cool the earth out of the airborne debris generated by each launch?<br clear="all">
<br>-- <br>Stefano Vaj<br>