Feature May 5, 2009
A Universal Art Form - NASA's Wide Field and Planetary Camera 2
Throughout history, humanity has been moved by the work of the great artists of
their age. Wielding brush, chisel or baton, these masters of expression have
been able to interpret the environment around them in innovative ways,
providing their public new avenues to explore their own senses and emotions.
But as with so many career fields, the role and tools of the artisan are changing.
NASA's Wide Field and Planetary Camera 2 (WFPC2) is one such new tool of
artistic expression. The name may be unfamiliar to you, but more likely than not,
you know of -- and have been moved by -- its iconic tableaus. For this camera is
the implement by which humans first bore witness to some of the most inspiring
and thought provoking vistas in the known universe.
"I cannot tell you how many times I have heard people tell me how much this
picture or that image has meant to them," said John Trauger, principal
investigator of the Wide Field and Planetary Camera 2 at NASA's Jet Propulsion
Laboratory in Pasadena, Calif. "After a while, I began to realize what we have
achieved reached beyond the scope of pure science and became something
more."
Born as a clone, a safeguard, to be used only in the most dire circumstances,
WFPC2 was employed under exactly those conditions. Since its arrival aboard
NASA's Hubble Space Telescope 15-and-a-half years ago, the baby grand
piano-sized camera has been collecting and analyzing the photons of deep
space, and redefining our cosmos.
"The WFPC2 image I remember most is of the Eagle Nebula," said Ed Weiler,
associate administrator for NASA's Science Mission Directorate in Washington.
"It has these pillars of gas and dust that are trillions of miles long. You know
there are new stars and planets being formed in there, and the colors are just so
intriguing. But what really got me was not my reaction to the picture, but the
reaction of the American public."
Imaged by WFPC2 on April 1, 1995, the Eagle Nebula, 7,000 light-years away, is
composed of dense, towering clusters of interstellar hydrogen, oxygen and
sulfur. Emerging from these towers of cosmic material can be seen newborn
stars. It is, in essence, an interstellar nursery.
"After we released the image during a press conference, CNN continued to
cover the story live," said Weiler. "People felt compelled to call in with their
reactions to this one picture. They were seeing the faces of famous people. One
person thought he saw Elvis. Others called it the pillars of creation. I mean this
picture touched Americans in a way I have never seen an astronomical picture
do."
Another famous WFPC2 portrait reached out and touched people by peering
back almost to the very beginning of the universe itself.
"The original Hubble Deep Field was the deepest image mankind had ever
taken out across the universe, literally back in time," said Dave Leckrone, senior
project scientist at the Space Telescope Science Institute, Baltimore, Md. "That
was the first time we really drove the Hubble Space Telescope to its limits in
terms of its ability to see extremely faint objects extremely far away."
Over 10 consecutive days in December 1995, Hubble and WFPC2 stared at a
speck of sky no bigger than a grain of sand held at arm's length. Soaking in the
paltry traces of light (four-billion times fainter than can be seen by the human
eye), WFPC2 generated 342 separate images. When all 342 were combined,
the resulting image pulled back the curtain on a part of the universe no one had
seen before and few had imagined.
"You have got to appreciate that the Hubble Deep Field was taken of a part of
the sky that was purposefully chosen to be as empty as people could imagine,"
said Leckrone. "Astronomers looked at ground-based images of that little part of
the sky and said it was basically black - there wasn't anything there. And then
you take this Hubble Deep Field and suddenly you see that it is not empty at all.
It is filled with thousands of galaxies of every kind imaginable.
"It was just so beautiful," Leckrone added. It produced an emotional response in
people saying we are part of something bigger, and more complicated and more
beautiful than we ever thought before as human beings."
"One of my personal favorites is of a planetary nebula called MyCn18," said
Trauger. "This WFPC2 image has been widely reproduced in settings as
diverse as the cover of National Geographic [April 1997] and the cover of Pearl
Jam's "Binaural" CD.
The hourglass-shaped nebula has an intricate pattern of "etchings" in its walls.
A planetary nebula is the glowing relic of a dying, sun-like star. Scientists
theorize the hourglass-shape of this particular nebula is produced by the
expansion of a fast stellar wind within a slowly expanding cloud of interstellar
gas, which is denser near its equator than its poles.
While the star in one of Trauger's favorite images may be dying, the camera
itself is not. With more than 185,000 images of the cosmos under its belt,
WFPC2 is providing the kind of art astronomers, scientists and other people
around the world love, right up to the end. And as much as he values his
camera's time in the spotlight, the principal investigator for WFPC2 knows when
to put the brushes away.
"That camera is the grandpa, the oldest, longest-lasting instrument aboard
Hubble," said John Trauger. "But with all that history comes its fair share of
radiation damage and plain old obsolescence. It is tired, it is time for it to be
brought home."
The camera replacing WFPC2, the Wide Field Camera 3, is equipped with state-
of-the-art detectors and optics. The new imager is expected to improve Hubble's
discovery efficiency and extend its outstanding imaging performance.
"We can only guess what that new camera will discover," said Trauger. "But
history tells us that every increase in our reach will uncover new wonders. We
will learn still more about the life cycles of galaxies, stars and planetary systems,
and the unique astronomical setting of our Earth, and to me that means a lot.
WFPC2 helped us see the light."
The Wide Field and Planetary Camera 2 was designed and built by NASA's Jet
Propulsion Laboratory.
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