Catherine E. Watson
Johnson Space Center, Houston
| March 18, 2003
Don Petit, NASA's science officer
on the International Space Station.
Like most of us, the NASA Science Officer aboard the International
Space Station looks forward to Saturday mornings.
"Saturday is when we have a bit of free time," said Dr.
Don Pettit, the NASA Space Station Science Officer on the Expedition
Six crew. While some of the crew read books, play musical instruments
or watch movies, "I prefer to do 'Saturday Morning Science'
– fun experiments of my own design," Pettit said.
One recent Saturday, Pettit prepared a solution of water, soap and
glycerin, and fashioned a bubble-wand from thin wire. "I wanted
to see what thin films and bubbles might do in zero gravity and
felt it was a topic ripe for discovery," he said.
Next, Pettit injected some tiny mica flakes into the film, allowing
him to observe otherwise-hidden flows and swirls. "Then I blew
on the film, and fascinating patterns emerged. These tracer particle
patterns lasted for well over four hours, he said."
These films highlight the value of space for fundamental research
in fluid physics. Gravity-driven convection and three-dimensional
motions complicate fluid flow on Earth. A two-dimensional film of
weightless water is a splendid research tool that could yield valuable
data for many industries on Earth.
Pettit has also taken still pictures of cities at night, obtaining
very high-resolution images, and observed noctilucent or "night-shining"
clouds, rare and not fully understood atmospheric phenomena. "Over
the past few weeks we've been enjoying outstanding views of these
clouds above the southern hemisphere," Pettit remarked during
a NASA TV broadcast.
Pettit is a long-time noctilucent cloud-watcher. As a staff scientist
at the Los Alamos, N.M. National Laboratory between 1984 and 1996,
he studied noctilucent clouds that were seeded by high-flying sounding
rockets. "Seeing these kinds of clouds [from space] ... is
certainly a joy for us on the Space Station," he said.
Pettit intends to continue his Saturday Science activities until
his return home in early May.
"Observations of nature, no matter how seemingly arcane, are
like peeling off one more layer from the great onion of knowledge,
tickling your imagination with what you have found but always revealing
yet another tantalizing layer underneath," Pettit said. "I
hope we never get to the core."
A video of Pettit conducting his Saturday Science experiments will
be shown on NASA Television at noon EST, Wednesday, March 19, 2003.
Pettit's Saturday Science videos and written observations are available
on the Internet at:
Information about NASA scientific research, including Pettit's,
is available on the Internet at:
For information about research on the International Space Station
on the Internet, visit:
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