28-July-2005, 10:35 PM
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Vulcan Moderator
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Join Date: Oct 2001
Location: Greenbelt, MD
Posts: 24,311
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Spitzer finds burnt toast in young universe
Well, sort of:
Quote:
Spitzer Finds Life Components in Young Universe
NASA's Spitzer Space Telescope has found the ingredients for life all the way back to a time
when the universe was a mere youngster.
Using Spitzer, scientists have detected organic molecules in galaxies when our universe was one-
fourth of its current age of about 14 billion years. These large molecules, known as polycyclic
aromatic hydrocarbons, are comprised of carbon and hydrogen. The molecules are considered to
be among the building blocks of life.
These complex molecules are very common on Earth. They form any time carbon-based
materials are not burned completely. They can be found in sooty exhaust from cars and airplanes,
and in charcoal broiled hamburgers and burnt toast.
The molecules, pervasive in galaxies like our own Milky Way, play a significant role in star and
planet formation. Spitzer is the first telescope to see these molecules so far back in time.
“This is 10 billion years further back in time than we’ve seen them before,” said Dr. Lin Yan of
the Spitzer Science Center at the California Institute of Technology in Pasadena, Calif. Yan is
lead author of a study to be published in the August 10 issue of the Astrophysical Journal.
Previous missions -- the Infrared Astronomical Satellite and the Infrared Space Observatory --
detected these types of galaxies and molecules much closer to our own Milky Way galaxy.
Spitzer's sensitivity is 100 times greater than these previous infrared telescope missions, enabling
direct detection of organics so far away.
Since Earth is approximately four-and-a-half billion years old, these organic materials existed in
the universe well before our planet and solar system were formed and may have even been the
seeds of our solar system.
Spitzer found the organic compounds in galaxies where intense star formation had taken place
over a short period of time. These “flash in the pan” starburst galaxies are nearly invisible in
optical images because they are very far away and contain large quantities of light-absorbing
dust. But the same dust glows brightly in infrared light and is easily spotted by Spitzer.
Spitzer's infrared spectrometer split the galaxies’ infrared light into distinct features that revealed
the presence of organic components. These organic features gave scientists a milepost to gauge
the distance of these galaxies. This is the first time scientists have been able to measure a
distance as great as 10-billion light years away using the spectral fingerprints of polycyclic
aromatic hydrocarbons.
"These complex compounds tell us that by the time we see these galaxies, several generations of
stars have already been formed," said Dr. George Helou of the Spitzer Science Center, a co-
author of the study. “Planets and life had very early opportunities to emerge in the universe.”
Other co-authors include Ranga-Ram Chary, Lee Armus, Harry Tepliz, David Frayer, Dario
Fadda, Jason Surace, and Philip Choi, all of the Spitzer Science Center.
The Jet Propulsion Laboratory manages the Spitzer Space Telescope mission for NASA's
Science Mission Directorate, Washington. Science operations are conducted at the Spitzer
Science Center at Caltech. Caltech manages JPL for NASA. Spitzer's infrared spectrograph was
built by Cornell University, Ithaca, N.Y. Its development was led by Dr. Jim Houck of Cornell.
The Infrared Astronomical Satellite was a joint scientific project sponsored by the United States,
the Netherlands, and the United Kingdom. The Infrared Space Observatory was a European
Space Agency mission with Japan’s Institute of Space and Astronautical Science and NASA.
For information on the Spitzer Space Telescope visit: http://www.spitzer.caltech.edu/Media .
For more information on NASA missions and programs visit: www.nasa.gov .
Gay Yee Hill (818) 354-0344
Jet Propulsion Laboratory, Pasadena, Calif.
News Release: 2005-123 July 28, 2005
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