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BradGuth
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 Posted: Tue Jun 19, 2007 2:07 am Post subject: Re: In the Shadow of the Moon |
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On Jun 18, 2:37 pm, "Jonathan" <w...@bellsouth.net> wrote:
| Quote: |
"OM" <om@all_trolls_must_DIE.com> wrote in message
news:kv9c73p86higvkmdhpo3857bp1gln7md44@4ax.com...
On Sun, 17 Jun 2007 20:10:31 +0100, Dr J R Stockton
j...@merlyn.demon.co.uk> wrote:
Strictly, L4 and L5 are not in Earth's orbit around the Sun, taking that
as defined by the centre of the Earth.
L4 and L5 each form an equilateral triangle with the centres of Earth
and Sun; however, the Earth does not orbit the centre of the Sun but the
Earth-Sun barycentre.
...One point that hasn't been made yet: if these points are as stable
as claimed, then there's the argument that they should have collected
a lot of debris and dust, especially the L4 & L5 points. And yet, so
far we haven't detected anything sitting there.
Sure there is according to this. It only takes about
30 seconds to check facts these days. You should
try it.
"A number of asteroids have been found to occupy
Jupiter's L4 and L5 points, orbiting the Sun at the
same distance as Jupiter, and 60° ahead and behind it.
These asteroids bear the names of Trojan heroes, so
the L4 point and the L5 point are often called
'Trojan points', with L4 holding the 'leading Trojans'
and L5 the 'trailing Trojans'. Recently a few small
asteroids have been found in the Trojan points
of Mars, and there is an accumulation of dust
at the Earth's Trojan points, but no asteroids."http://www.bbc.co.uk/dna/filmnetwork/A947333
But we certainly could park our pesky moon out there if need be. |
No matters what, we simply can't afford to leave our physically dark
and somewhat salty moon alone. Its nearby orbital mascon worth of
gravity/tidal forces are the main reason this Earth, which is 98.5%
fluid, is getting hotter.
Obtaining 3.5% solar isolation via the artificially imposed shade
that's created by having that moon parked within Earth's L1 is perhaps
accomplishing a little too much of a good thing, as Earth might
actually start getting itself more than a little too cold, but then we
could always move that moon +/- whatever it takes (if need be using L4
or L5 for safe keeping) as for allowing as much solar influx as need
be, or given a few laser cannon beams of IR energy could easily be
directed at whatever specific terrestrial locations that'll need a
little help from getting iced over. The tether dipole element of the
LSE-CM/ISS could get those massive laser cannons to within 2r of Earth
(a bit closer if you'd dare).
BTW, there'd still be a working tide on Earth, though based on a
reliable 24 hour cycle and at roughly half the intensity of what it
currently is.
-
Brad Guth |
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Henry Spencer
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| Posted: Tue Jun 19, 2007 7:41 am Post subject: Re: In the Shadow of the Moon |
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In article <kv9c73p86higvkmdhpo3857bp1gln7md44@4ax.com>,
OM <om@all_trolls_must_DIE.com> wrote:
| Quote: |
...One point that hasn't been made yet: if these points are as stable
as claimed, then there's the argument that they should have collected
a lot of debris and dust, especially the L4 & L5 points. And yet, so
far we haven't detected anything sitting there.
|
There was long some suspicion that the Gegenschein -- a faint patch of sky
glow exactly 180deg away from the Sun in our sky -- might be dust
temporarily swept up by Earth's L2 point. Only when Pioneer 10 confirmed
that the Gegenschein was still detectable far away in interplanetary space
did this idea die. (The Gegenschein is just a bright part of the zodiacal
light -- sunlight scattered from interplanetary dust. The scattering is
particularly strong in directions more or less right back at the Sun, for
reasons now well understood. The final confirmation was Pioneer 10 data
showing that the intensity of both the zodiacal light and the Gegenschein
drop rapidly to zero as you go out through the asteroid belt -- the source
of the dust.)
And it's conceivable that there are "Earth Trojans" -- small asteroids
wandering around in the vicinity of Earth's L4 and L5 -- although none
have yet been spotted. The L4 and L5 points of the smaller planets are
not as stable as those of Jupiter -- the archetypal Trojan points --
because of planetary perturbations, but there are several Mars Trojans
known, so Earth Trojans seem possible. The things are hard to spot,
because they sort of "orbit" the actual points, wandering a long way away
along (well, roughly along) the planet's orbit and then coming back. And
a large part of Earth's orbit is difficult to search because it's too
close to the Sun in our sky. Even Jupiter's Trojans are spread over quite
large volumes of space -- they're not a tight little clump at each point.
And there were pre-spaceflight reports of faint patches of sky glow at the
Moon's L4 and L5 points, but people looking with modern instruments have
consistently found nothing. The lunar L4 and L5 points are not all that
stable when you figure in solar perturbations.
--
spsystems.net is temporarily off the air; | Henry Spencer
mail to henry at zoo.utoronto.ca instead. | henry@spsystems.net |
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