Strings in WFPC03.GIF


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PUBLIC INFORMATION OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109. TELEPHONE (818) 354-5011
PHOTO CAPTION January 13, 1994
This sequence of pictures shows successive steps in optical
improvement from ground-based telescopes to the newly improved
Hubble Space Telescope. The images demonstrate that the repaired
telescope can see stars that could never before be detected.
At upper left is an outer region in the galaxy M100 as imaged by
the telescope's second-generation Wide Field and Planetary
Camera. The WFPC-II incorporates modified optics that correct
for the aberration of the telescope's primary mirror. This i
demonstrates one of the most important servicing achievements --
the ability to detect and measure the light from individual faint
stars in distant galaxies. The stars indicated by the arrows
have the approximate brightness of special yardstick
stars called
Cepheid variables in M100. While these specific stars may not be
Cepheids, astronomers expect that repeated measurements of
hundreds of similarly bright stars spread throughout the galaxy
will turn up several dozen Cepheids. By accurate
ly measuring the
brightness of these "standard candles," astronomers will use the
WFPC-II to determine an accurate distance to M100. When combined
with similar measurements for other galaxies, this distance will
provide a crucial link in the chain th
at astronomers use to
determine the expansion rate, age and size of the universe.
At upper right in an image taken by the WFPC-I on November 27,,
1993, just a few days before the Hubble servicing mission. WFPC-
I's resolution represents a significa
nt improvement over what can
be seen from the ground. However, images made before the
servicing mission revealed only the brightest objects seen in the
frame to the left.
At lower left is a panel showing the computer-processed WFPC-I
image, using
a technique commonly employed to improve Hubble
images taken before the servicing mission. Although processing
can significantly sharpen up features, they cannot recover faint
objects; many stars revealed in the WFPC-II image cannot be seen
or measur
ed in the reconstructed WFPC-I image.
At lower right is an image of the same region in M100 taken with
the 5-meter (200-inch) Hale telescope at Mt. Palomar in
California. The resolution is just under an arc-second, slightly
better than typical nigh
t-sky conditions for ground-based
observing.
The Jet Propulsion Laboratory developed the Wide Field and
Planetary Camera-II for NASA's Office of Space Science.
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