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Old 03-27-2003, 02:43 PM   #1
Wynd
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Giant flash in the sky


Last night just before midnight central time, my friend and I were walking outside when all of a sudden the sky changed from black to purple to sea-green to whitish blue, all in the space of a few seconds. It was really bright, i mean brighter than day. Then it faded back to normal. We listened to the news on the radio and people were saying it was a meteor shower, and people saw it as far north as Milwaukee and as far south as tenessee. Anyone else see this or hear anything of it?
 
Old 03-27-2003, 02:48 PM   #2
mcleodnine
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http://www.spaceweather.com/

Subscribe to the mailing list - it's low volume and gives nifty alerts for aurora watches and other nifty solar/plantary events.
 
Old 03-27-2003, 03:59 PM   #3
Dave Skywatcher
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Great site -- thanks, mcleodnine!
 
Old 03-27-2003, 04:25 PM   #4
mcleodnine
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It would be an _awesome_ site if they could get the Auroras to happen on a clear night.
 
Old 03-29-2003, 07:38 AM   #5
jgr220
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Quote:
Originally posted by mcleodnine
http://www.spaceweather.com/

Subscribe to the mailing list - it's low volume and gives nifty alerts for aurora watches and other nifty solar/plantary events.
Great site but a rock 1-2 meters wide weighing 10 metric tons? Concrete weighs approximately 3300 lbs per cubic yard. Musta been some prety dense stuff.
 
Old 03-29-2003, 09:47 AM   #6
moses
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A metric ton is 1000 kg, which would give a density of (assuming a sphere):
Code:
10000kg/[4/3 * Pi * (1m)^3] ~ 2386 kg/m^3.  
or
10000kg/[4/3 * Pi * (2m)^3] ~ 298 kg/m^3.
This is easily just rock. Basalt (frozen lava) is about 3000 kg/m^3.

Last edited by moses; 03-29-2003 at 09:56 AM.
 
Old 03-29-2003, 09:55 AM   #7
Kurt Weber
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I saw "Giant flash in the sky" and I was thinking of breasts...
 
Old 03-29-2003, 10:58 AM   #8
mcleodnine
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Quote:
Originally posted by moses
A metric ton is 1000 kg, which would give a density of (assuming a sphere):
Code:
10000kg/[4/3 * Pi * (1m)^3] ~ 2386 kg/m^3.  
or
10000kg/[4/3 * Pi * (2m)^3] ~ 298 kg/m^3.
This is easily just rock. Basalt (frozen lava) is about 3000 kg/m^3.

It looks like moses beat me to it.

My good friend Carole has a rock and gem store so of course I checked with her and she provided me with a meteorite sample. It's a blobby little hunk of metal that weighs in at about 107g and is quite attracted to a magnet recovered from an old hard drive so I'm going to assume it's mostly iron.

Armed with a postal scale and some water I figured this piece to be around 4700kg/m^3.

It's pretty obvious that I really need to find something better to do with my weekends.
 
Old 03-29-2003, 07:48 PM   #9
moses
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Quote:
Originally posted by mcleodnine
It looks like moses beat me to it.

My good friend Carole has a rock and gem store so of course I checked with her and she provided me with a meteorite sample. It's a blobby little hunk of metal that weighs in at about 107g and is quite attracted to a magnet recovered from an old hard drive so I'm going to assume it's mostly iron.

Armed with a postal scale and some water I figured this piece to be around 4700kg/m^3.

It's pretty obvious that I really need to find something better to do with my weekends.
It's kind of my "real" job (linux sysadmin isn't my "real" job, I only
do that about 1/4 time). That meteorite she provided you with is
probably nickel-iron (most commonly found, least common impactor).
I like your volume measurement technique, most people don't
remember Archimedes. =-}
 
Old 04-01-2003, 07:16 PM   #10
Pcghost
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I use to love to see the aurora in Alaska back in the eighties (I imagine it hasn't changed). Most beautiful thing I have ever seen.
 
  


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