[meteorite-list] New Image Shows Speck of Comet Dust from Stardust Mission

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Fri Feb 3 12:46:05 2006
Message-ID: <200602031744.k13HiPl03179_at_zagami.jpl.nasa.gov>


Seeing stardust: New image shows speck of comet dust from NASA mission
UC Berkeley News
1 February 2006

Comet dust embedded in aerogel
Photo by Hope Ishii/Lawrence Livermore National Laboratory

This photo from NASA shows a mote of comet dust embedded in a tiny wedge
of aerogel extracted from the Stardust collectors that returned to Earth
Jan. 15. The comet dust was extracted by University of California,
Berkeley, researcher Christopher Snead using new nanomanipulation
techniques developed at the campus's Space Sciences Laboratory.

The grain of dust entered the aerogel from the lower right at supersonic
speed and moved to the upper left, where it can be seen as a bright dot
at the end of the carrot-shaped trail. The large oval cavity at lower
right was blown out by shock waves created as the grain exceeded the
sound barrier in the aerogel. At right is a micromachined fixture
developed by UC Berkeley physicists, in collaboration with Chris Keller
of MEMS Precision Instruments, to extract grains of comet and
interstellar dust from the detectors.

A team led by UC Berkeley research physicist Andrew Westphal also
developed the device - a glass needle attached to a
robotically-controlled micromanipulator - to cut out the wedge-shaped
piece of aerogel from a larger aerogel tile. The aerogel-embedded comet
grain, still in the clean room at the Johnson Space Center in Houston,
will be distributed to researchers for study. The trail is about 1
millimeter long, while the dust grain is only 10 microns across, or
one-tenth the diameter of a human hair.
Received on Fri 03 Feb 2006 12:44:25 PM PST

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