I believe the "shockwave" preceding the star is an electromagnetic
phenomenon involving extremely high temperatures and ionized
species. The bow shock in front of a bullet can be analyzed quite
precisely without the temperatures rising high enough to ionize the
gases. A missile, or meteor, or the space shuttle re-entry is
another matter. There one has to account for the ionized gases owing
to the high speeds and the resultant high temperatures.
Roger
On 19 Aug 2007, at 8:32 AM, lookaround360@xxxxxxxxxxxxxxxxx wrote:
Hmmm? They DO mention Mira's bow shock:
"In addition to Mira's tail, the Galaxy Evolution Explorer also
discovered a bow shock, a type of buildup of hot gas, in front of the
star, ..."
This gives yet more job security for a lot of cosmologists and
astronomers - looking for stuff visible in the UV wave length.
Got any pictures of "Dark Matter" to share with NASA Andy?
AZ
Build a 120/35mm Lookaround!
The Lookaround Book.
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-------- Original Message --------
Subject: [SPAM] Re: NASA news release with PhotoForum connection -
sort
of
From: Roger Eichhorn <eichhorn@xxxxxx>
Date: Fri, August 17, 2007 2:04 pm
To: List for Photo/Imaging Educators - Professionals - Students
<photoforum@xxxxxxxxxxxxxxxxxx>
Andy,
That's great. We can see the turbulence following, but not the
shockwave. Of course, Andy's phenomenon requires a compressible
fluid to surround the bullet.
Roger
On 17 Aug 2007, at 8:50 AM, ADavidhazy wrote:
OK - so a little bitty shameless self-promotion! ;)
This note is for nothing more than to share I've made a
connection to a NASA news release - 1st for me!! You can
start (if interested) with the news release at:
http://www.jpl.nasa.gov/news/news.cfm?release=2007-090
or immediately go further in the news release page to:
http://www.nasa.gov/mission_pages/galex/20070815/
or right to my tiny contribution at:
http://www.nasa.gov/mission_pages/galex/20070815/f.html
or see this last page off my web folder at:
http://www.rit.edu/~andpph/a-misc/nasa-bullet-shadowgraph-1.jpg
cheers!
andy
