"Vapor is the evaporation of boiling liquid water."
And that is the only possible source of water vapor?? So, have you ever
been in a cloud? fog?? What was boiling to make those then??
Again, your limited experience with how materials behave on Earth in
atmosphere, under pressure and with gravitational forces is blinding you
to the fact that materials can and do behave differently in space.
Water might boil at 100 C at sea level, but in space it "boils" away at
very low temperatures.
http://www.newton.dep.anl.gov/askasci/chem07/chem07192.htm
Vapor in the context given by the EPOXI scientists refers to H2O (and
other materials) in a gaseous form. Ice would refer to that material
being in a solid form. That solid form does not necessarily mean it is a
block of ice like an icecube.
And I'm sure you've heard the riddle of what weighs more: a pound of
feathers or a pound of lead?
They "weigh" the same, but you are going to need a whole heck of alot of
feathers to get a pound!
Clear Skies!
Elizabeth
[email protected] wrote:
Hi Bob.
Perhaps you did not read the NASA link I provided in my previous post.
Here it is in case you missed it;
http://www.foxnews.com/scitech/2010/11/19/spacecraft-flies-past-snowstorm-comet/
Again, all do respect here.
To be clear my questions here relate to gaining the knowledge of what rocks to look for that might be of a cometary origin. Not to knock others opinions. I just want logical answers.
The link does say they think it is "water ice" as opposed to other substances.
They go on to say that "jets of carbon dioxide *appear to be* fueled by water vapor. Vapor is the evaporation of boiling liquid water. But later say there are also large hailstone chunks to boot.
I think it looks like hot dust (smoke) .
They say some of the hailstorm of "Fluffy Ice" that hit the spacecraft may have been between the size of a golf ball and a basketball. This with NO damage to the spacecraft?
Dr. A. Hearn also points out "how different Comets are from one another".
Aw Ha moment here? They are different!
You ask. How could they stay hot?
That is the big question.
I suppose it depends upon what they are made of. Iron might stay hot longer than mica for example.
And or, Perhaps they contain some source of renewable energy source within them? . A source that is yet known to us?
How do we know whether they are cooling or not?
That coupled with the fact that all things take time.
Look no farther than the published cooling rates of iron meteorites.
The Tucson iron meteorite is said to not display the widmanstten pattern on an etched surface primarily because in spite of the fact that it contains plenty of nickel, it cooled too fast.
This cooling rate has been calculated for the Tucson Iron ring meteorite to be in the order of 1 degree C per one thousand years. This again is considered a rapid cooling rate.
No, nothing makes much sense if you believe what they say that hailstones the size of golf balls to basketballs hit this craft. It had to of been smoke from the intense heat of this comet to have not damaged the craft. ice and even melted ice in the form of water at 27K miles per hour would have damaged the craft.
Incidentally , I took a piece of coal in the dark and illuminated it. Sorry, but it looks nothing like the close-up pics of Hartley 2 and that is the comet we are talking about here. No antique distant pics from the past can compare with these new pics. We are in a new age of discovery and should give up these old and possibly obsolete photos and theories of the past.
One more thing.
If these so called "infrared spectrometers" tell us what this Comet is made
of then I would love to hear it? Please spare me the Fluffy ice though. What other
minerals are abundant on comet hartley 2? Thanks.
Again.
IMHO.
Carl
--
Carl or Debbie Esparza
Meteoritemax
---- Bob King <[email protected]> wrote:
Hi Carl and all,
I thought it was clear that the fluffy snow chunks were water ice.
They can determine composition of materials on and around the comet
with the infrared spectrometer aboard the probe. Water was discovered
a while back by ground-based telescopes in quite a number of comets.
Also, while some of the stuff spewing out is a few inches across,
there's probably a lot more that's tinier - everything from smoke-like
dust particles to tiny bits of snow. Perhaps something on this smaller
end of the scale struck the craft during its flyby.
A demonstration I use for my class is to take a piece of black coal,
turn off the lights and light it only by the beam from a small lamp to
simulate how a comet appears in space. You'd be surprised by how
brightly coal "shines" again the unlit background.
Comets were long ago found to not be hot. How could something the
interior of something that small (approx 1 mile long) on an orbit that
takes it beyond Jupiter remain warm for very long? Only the outer
surface is warmed by sunlight.
Regards,
Bob
On Mon, Nov 15, 2010 at 3:14 PM, Ron Baalke <[email protected]> wrote:
Nov. 15, 2010
Dwayne Brown
Headquarters, Washington
202-358-1726
[email protected]
Jia-Rui Cook
Jet Propulsion Laboratory
818-354-0850
[email protected]
Lee Tune
University of Maryland, College Park
301-405-4679
[email protected]
MEDIA ADVISORY: M10-161
NASA ANNOUNCES COMET ENCOUNTER NEWS CONFERENCE
WASHINGTON -- NASA will hold a news conference at 1 p.m. EST on
Thursday, Nov. 18, to discuss new scientific findings from the recent
EPOXI mission spacecraft encounter with comet Hartley 2.
The news conference will originate from the NASA Headquarters
auditorium at 300 E St. SW in Washington. It will be carried live on
NASA Television.
Media representatives may attend the conference, ask questions by
phone or from participating NASA locations. To RSVP or obtain dial-in
information, journalists must send their name, affiliation and
telephone number to Steve Cole at [email protected] or call
202-358-0918 by 11 a.m. EST on Nov. 18.
The news conference participants are:
-- Michael A'Hearn, EPOXI principal investigator, University of
Maryland
-- Jessica Sunshine, EPOXI deputy principal investigator, University
of Maryland
-- Tim Larson, EPOXI project manager, Jet Propulsion Laboratory,
Pasadena, Calif.
-- Pete Schultz, EPOXI scientist, Brown University
NASA's EPOXI spacecraft successfully flew past comet Hartley 2 on Nov.
4, providing scientists the most extensive observations of a comet in
history.
For NASA TV streaming video and downlink information, visit:
http://www.nasa.gov/ntv
For more information about NASA's EPOXI mission visit:
http://www.nasa.gov/epoxi
-end-
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