much appreciated Kevin!
----- Original Message -----
From: "Kevin Forbes" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, June 03, 2006 10:05 PM
Subject: [meteorite-list] Extra solar impactors and comets
Greetings all,
a thought to pervade your mind and something else to contemplate apart
from your navel.
The oort cloud, the very outer extremeties of our solar system, millions
of bodies, probably mainly ices mixed with silicates. Cometary bodies and
planetary orbs lost to the depths of space. But, they are there. Other
star systems probably have a similar 'oort' thing around them, slowy
following the gravitational attraction of the central star in that system
as it drifts through the galaxy. Over time, a passing of stars occurs, not
an entirely close call, but one that would allow material and bodies of
one system to migrate or be stolen by the other system. A dramatic change
in course for the migrating body, some may just change from their origanl
formation parent to their new foster star and stay in the darkness, some
may have a different set of motions inflicted upon them, sending them on a
course that sweeps through the inner system of rocky planets. Look out.
How many orphans are there in space, not gravitationally attached to any
star, having either been ejected through orbital conflicts in a system
with a larger more massive body, or formed ( I shall call this, 'A Dark
System' ) a dark system, a coagulation of material from a cloud of dust
and icy particles that certainly forms lumps, but comes nowhere near that
of forming a solar system. How many 'Dark Systems' are there, and how
often do they collide with star systems and loose material or meld with.
And now, I must make a comment regards a statement by a scientist that
made, in my opinion, an awakening utterance. At first I thought,
'outrageous', 'how silly'. Silicate dusts were found in cometary debris,
he therefore postulated that comets must have formed near the sun.
????????????
In my mind, I see bodies of the inner solar system being the source of the
silicate dusts, their constant impacts creating a constant supply of fine
dusts that would be blown by solar wind to the extremeties of the outer
solar system, where they would fall upon any icy cometary bodies that they
happened to chance upon. It must be obvious to that icy bodies such as
comets would NOT form near the sun, due to the temperature being high. Any
comets hanging around near the inner solar system, Jupiter and inwards
would quickly evaporate. Comets must be born in the cold outer reaches of
our or other systems. Some comets in our system at this moment may have
been stolen from passing systems as the two interacted for a period during
their passing of each other. The fact that there are silicate dusts mixed
up in the ices, would suggest that they have been collecting 'fairy dust'
for a period of time. What could have happened??? Perhaps before the sun
burst into life, in the pre-solar nebula, the bulk of the comets did in
fact reside in the inner solar system. When the larger bodies began to
accumulate they were ejected en-masse to the outer reaches where they are
now existing as a record of what happened, waiting for us to go there, and
study. Can isotopic ratios give us a clue as to there original place of
formation in the solar nebula?
Is our understanding of such things as isotopic data and distribution
satisfactory to enable this?
I have been absent from the list for a while, I may have missed something
that I should not have.
If you are thinking that I need a thick ear, then please, bash away.
Yours faithfully, Kevin Forbes, VK3UKF.
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