Fresh
from its fall to Earth last weekend, the Stardust sample return capsule has
been opened in a cleanroom at the NASA Johnson Space Center (JSC) in Houston, Texas.
"It
exceeds all expectations," said Donald Brownlee, Stardust's lead scientist from
the University of Washington, Seattle. "It's a huge success," he explained in a
University of Washington statement released today.
"We
can see lots of impacts. There are big ones, there are small ones. The big ones
you can see from 10 feet away," Brownlee observed.
A
preliminary estimation is that there might be more than a million microscopic
specks of dust embedded in Stardust's aerogel-laden collector. Furthermore, it
appears--from the size of the carrot-shaped impact tracks in the
aerogel--that there are about 10 particles of 100 microns in size.
The
largest is around a millimeter, Brownlee added, and he says the biggest track
is nearly large enough to insert your little finger. In the largest aerogel
tracks, investigators can see the black comet dust at the end of the track.
JSC
will be the curator of the samples collected by Stardust from comet Wild 2, as
well as the interstellar dust particles that Stardust snagged during its nearly
seven year voyage. As many as 150 scientists worldwide are awaiting samples to
study.
Big payoff
Scientists
and engineers are elated with the outcome of NASA's Stardust mission, after a
2.9 billion mile round-trip space voyage.
The
101-pound (46-kilogram) Stardust capsule returned to Earth, slamming into the
atmosphere at a blistering 29,000 miles per hour - the greatest velocity ever
attained by any human-made object diving into Earth's atmosphere on record.
The
sample return capsule landed in the pre-dawn hours January 15 at the Utah Test
and Training Range (UTTR), touching down on the desert floor under parachute.
After
the capsule's recovery, a "bank vault-like" canister holding the interstellar
and comet samples was removed in Utah for transportation to JSC.
Stardust
was launched on February 7, 1999. The encounter and cometary dust sample
collection at comet Wild 2 occurred January 2, 2004 - with the spacecraft
flying by the comet at roughly 149 miles (240 kilometers) distance.
As
a NASA Discovery-class mission, Stardust is a $212 million econo-class science project.
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