Reported April 2008

ABOUT THE SPITZER TELESCOPE: The Spitzer Space Telescope was launched on August 25, 2003. Spitzer detects infrared energy radiated by objects in space. Most of this infrared radiation is blocked by the Earth's atmosphere and cannot be observed from the ground. Spitzer allows us to peer into regions of space that are hidden from optical telescopes. Many areas of space are filled with vast, dense clouds of gas and dust that block our view. Infrared light, however, can penetrate these clouds, allowing us to peer into regions of star formation, the centers of galaxies and into newly forming planetary systems. Infrared also brings us information about the cooler objects in space, such as smaller stars, which are too dim to be detected by their visible light, and also extrasolar planets and giant molecular clouds. Many molecules in space, including organic molecules, have their unique signatures in the infrared.

WHAT IS INFRARED LIGHT? Infrared radiation is an invisible form of light that is usually detected as heat, like the sun shining on our face or the warmth of a campfire. It has the same properties as visible light; for example, it can be focused and reflected. The only difference is that it has a longer wavelength, which means it can't be seen with the naked eye. Light is made of tiny particles called photons and the wavelength tells us how fast those particles are vibrating. The shorter the wavelength, the faster the particles are moving. Shorter light waves look blue while longer ones look red. The wavelength of infrared light is so long it can't be seen at all. Any warm object gives off infrared radiation. By checking in the infrared spectrum, engineers can detect heat leaks in buildings, doctors can find hidden tumors in the body and biologists can locate diseased plants in a forest. Astronomers use infrared imaging to detect warm dust around new stars that are not yet "hot" enough to emit visible light.

The American Astronomical Society and the American Geophysical Union contributed to the information contained in the TV portion of this report.

If you would like more information, please contact:

Dr. Carey Lisse
Johns Hopkins University Applied Physics Laboratory
Laurel, MD
(240) 228-0535
Carey.Lisse@jhuapl.edu

American Astronomical Society
Washington, DC 20009-1231
(202) 328-2010
http://www.aas.org
aas@aas.org

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