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Location: UFOUpDatesList.Com > 1999 > Apr > Apr 9

Re: Were Arnold UFOs Fireballs?

From: Bob Young <YoungBob2@aol.com>
Date: Thu, 8 Apr 1999 23:52:56 EDT
Fwd Date: Fri, 09 Apr 1999 22:48:27 -0400
Subject: Re: Were Arnold UFOs Fireballs?

>From: Donald Ledger <dledger@ns.sympatico.ca>
>Date: Thu, 08 Apr 1999 20:40:47 -0300
>Fwd Date: Thu, 08 Apr 1999 21:04:04 -0400
>Subject: Re: Were Arnold UFOs Fireballs?


>With an approximate time of 2.5 to 4 seconds from top of
>atmosphere to ground level for a meteor's travel, how can anyone
>in that field even consider meteors? How does something like
>this get in a SETI journal?

Hi, Don:

Where did you got these numbers?  A meteor begins to glow about
115 kms until about 50 kms, and if it is large enough then drops
at free fall to the Earth's surface.  Larger meteoroids can
continue to glow to lower altitudes that small ones.  Meteoroid
speeds upon _entering_ the atmosphere range from 11 to 74
kms/sec depending upon whether the Earth catches up to the
meteoroid in its orbit or it hits us head on.

So, 2.5 to 4 seconds might be a good length of time for some
visible meteors, others have a longer "dark" flight.  Also, the
hypothesis obviously refers to a meteor travelling in a near
horizontal path.  A bright, widely photographed fireball like
this back in the early 1970s is known to have had a zenith to
horizon time of 1 minute.

Also, it is now believed that very bright meteor fireballs of
this type are not related to meteor showers, believed to come
from comets, but have their origins in the asteroid belt as
rocky objects.

Clear skies,

Bob Young

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