[meteorite-list] Space Ice

From: Steve Dunklee <sdunklee72520_at_meteoritecentral.com>
Date: Tue, 8 Sep 2009 02:19:49 -0700 (PDT)
Message-ID: <520172.11218.qm_at_web33202.mail.mud.yahoo.com>

why didnt you just say water boils away to a gas in a vaccume? and it would take an extremely large object to have the gravity necessary to hold water as ice ? even one molcular weight of water or 18 grams would ocupy a volume of 22.4 liters or 2.24 meters. or is it .224 meters? Anyway it would not be a solid ice ball. think 22.4 one liter bottles Avagodros number of molecules. One pound of ice or about 454 grams would be a slush ball over ten meters across.
   
KE=1/2mv^2
m - mass in slugs
v= velocity in feet per second
32.174 pounds = 1 slug

1 pound of ice hitting the atmosphere would have the following energy at 17 k miles per hour.
  1/2 [1/32.174(17kmph*5280feet per mile*60 minutes per hour*60 minutes per second)^2]

please excuse my dear aunte Sally

1/2 [.o3108 slugs(17kmph x 5280 f/mile x 3600 seconds/hour)^2]
1/2[.03108 slugs(89,760k feet per hour x 3600 seconds/hour)^2]
1/2[.03108 slugs(323,136,000 feet per second)^2]
1/2[.03108 slugs(1.04416x 10^17)]
1/2[3.245x10^15]
= 1.6x10^15 foot lbs of energy.

 or plenty enough energy to make a Tunguska like event with no crater.

solid ice chunks hitting the ground, or other objects either fell off an airplane or were ice balls suspended in the atmosphere like hail. if a tornado can pick up an 80k lb 18 wheeler I see no reason why a 100lb chunk of ice could not be held in the air by updrafts in the upper atmosphere.
   have a great day
Steve

--- On Mon, 9/7/09, Richard Kowalski <damoclid at yahoo.com> wrote:

> From: Richard Kowalski <damoclid at yahoo.com>
> Subject: Re: [meteorite-list] Space Ice
> To: "meteoritelist" <meteorite-list at meteoritecentral.com>, "Mike Hankey" <mike.hankey at gmail.com>
> Date: Monday, September 7, 2009, 3:12 PM
> Hey Mike,
>
> I'm wondering if it is Louis Frank's "Mini-Comets" that you
> heard being discussed?
>
> An idea first introduced over two decades ago, and
> discredited, Frank pushed the idea more strongly in the mid
> to late 90s due to new "evidence" and of course was rejected
> even more strongly.
>
> His hypothesis says as many as 30,000 twenty - forty ton
> objects hit the earth each day.
>
> No observational evidence supports the idea.
>
> Read here:
>
> http://impact.arc.nasa.gov/news_detail.cfm?ID=77
>
> A quick back of the envelope calculation shows that 30 tons
> of liquid water would be 7500 gallons or 28,390 liters. As a
> liquid that volume can also be represented as 28.39 cubic
> meters. Of course water ice has a larger volume.
>
> As I mentioned in a post yesterday, 2008 TC3 was about 5
> meters in diameter before entry. Assuming a perfect sphere
> (impossible) that would be about 65.45 cubic meters, or 2.3
> times larger by volume. If my maths are correct, the average
> diameter of these hypothetical "mini-comets would be 3.76-m
> spheres.
>
> Since one would assume that ice will have a higher albedo
> than TC3's 5%, blocks of ice will be *much* brighter than
> TC3 and with 30,000 of them impacting every DAY, we should
> see these thousands of these things all over the sky, all
> night long, every night. We often see objects that are much
> smaller and darker than this passing by the earth, so it is
> essentially impossible for this hypothesis to be correct.
>
> I won't discuss how hard it would be to maintain blocks of
> ice this small a size this close to the Sun without
> out-gassing.
>
> Meteorites are made of rock & metal only.
>
> --
> Richard Kowalski
> http://fullmoonphotography.net
> IMCA #1081
>
>
> --- On Mon, 9/7/09, Mike Hankey <mike.hankey at gmail.com>
> wrote:
>
> > From: Mike Hankey <mike.hankey at gmail.com>
> > Subject: [meteorite-list] Space Ice
> > To: "meteoritelist" <meteorite-list at meteoritecentral.com>
> > Date: Monday, September 7, 2009, 11:15 AM
> > Happy Labor Day Everyone,
> >
> > I've heard some people talk about how sometimes
> meteors can
> > be big
> > balls of ice.
> >
> > How common is this? Specifically what are the chances
> that
> > the PA
> > fireball I'm looking for could have been an ice ball?
> That
> > would
> > really suck.
> >
> > Thanks,
> >
> > Mike Hankey
> > http://www.mikesastrophotos.com
> > ______________________________________________
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> >
>
>
> ? ? ?
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Received on Tue 08 Sep 2009 05:19:49 AM PDT