Re: USA urges scientists to block out sun
- From: "Brad Guth" <bradguth@xxxxxxxxx>
- Date: Fri, 2 Feb 2007 22:51:49 +0000 (UTC)
"simple_language@xxxxxxxxx" <simple_language@xxxxxxxxx> wrote in message
news:1170036047.250084.235440@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
USA urges scientists to block out sun
http://groups.google.com/group/sci.space.policy/browse_frm/thread/7d2296fc879dbfee/930cc79604c90eee?lnk=st&q=brad+guth&rnum=4&hl=en#930cc79604c90eee
"Ian Stirling" <root@xxxxxxxxxxxxxxxxx> wrote in message
news:45c388d0$0$8719$ed2619ec@xxxxxxxxxxxxxxxxxxxxxxxxxx
You're not looking at millions or billions.
Sedna's orbital speed is somewhere around a kilometer a second.
If the total delta-v needed is 2Km/s, then it needs around 10^25 Ns of
impulse.
Saturn V produces a little under 10^10Ns, or that means 10^15 - or a
quadrillion.
A million billion.
By 2075 is when Sedna should have been moving along much faster, as well
as being a whole lot closer to boot. It seems that all we've got to do
is sort of keep that ball rolling in our direction, and then try to
figure out how the hell we're ever going to park that arriving orb in
our L1 pocket, without causing more collateral damage than it's worth.
Because of the applied energy, we'll most likely need to incorporate the
all-knowing wizardly expertise of our nuclear/U235 rocket master William
Mook, and/or perhaps accomplish something He3/fusion in order to make a
massive steam rocket thruster out of all that red ice.
How about some feedback as to the notions of litho-diverting that sucker
via massive impactors, like what got our moon into orbiting Earth?
-
Sliding Sedna in the back door, of essentially parking that icy redish
orb into Earth's L1 (along with some interactive station keeping
required), that's moving along at roughly 29 km/s, is at best going to
be a damn neat trick, not to mention having accomplished one heck of a
delta-V improvement from its current km/s status.
According to the preliminary orbital physics of Ian Stirling, if
doubling its velocity from 1.04 km/s to that of 2 km/s demands a delta-v
worth 1e25 Ns, whereas obtaining 29 km/s is then imposing 29e25 Ns, as
clearly representing what a truly horrific effort it's going to take,
along with resolving any number of other unresolved complications that
could easily develop along the way (such as running itself into Earth or
even smacking our moon could lead to some rather unfortunate
consequences).
However, Sedna may not be quite as large and massive as we'd thought,
and by the year 2075 it's going to be moving at a much greater velocity
before heading back out into the Kuiper belt. Diverting Sedna into
taking advantage of the gravity pull of Jupiter and of whatever else can
be accommodated, should greatly help to deliver the vast majority of the
required delta-v.
Of course, whatever analogy works on behalf of relocating Sedna is tens
of folds better off for the local task of merely pushing our local
mascon/moon away from us, from having otherwise been simply too close
and mascon/tidal GW nasty to Earth, whereas instead being safely
relocated to Earth's L1 seems perfectly doable. After all, our moon is
already going along for the ride at nearly 30 km/s, and best of all,
there could still be the one and only LSE-CM/ISS as owned and operated
by China, along with its tether dipole element reaching to within 4r of
Earth.
Too bad we don't seem to own a suitable supercouputer, along with a
fully interactive 3D physics simulator of dealing with such complex
orbital mechanics. Perhaps Russia, China or even India has one, and as
such we could beg for their services.
-
Brad Guth
--
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