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Peter Menzel Photography
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![Mountain View, California.Vials of chemicals known as P.A.H. (Polycyclic Aromatic Hydrocarbons) luminesce in ultraviolet light. These molecules, naturally occuring throughout the depths of space, are believed by these and and other researchers to be possible origins of life on earth. P.A.H.s have been found to become chemically modified when surrounded by ice and exposed to ultraviolet radiation -- a situation likely to occur in space.iOnce molecularly altered, the modified P.A.H.s closely resemble known organic molicules that are found in abundance on earth. Thus P.A.H.s may be found to be the first stage in a chain of molecules that led to life on earth. Researchers at NASA/Ames are simulating the conditions in space in order to study these alterations in the molecular structure of P.A.H.s. They also track P.A.H.s as they travel through interstellar space towards developing solar systems where they may become transformed into the seeds of life, all to hypothesize about the origins of life on earth..[1999]](https://www.menzelphoto.com/img-get2/I0000Xise9yQw_IU/fill=/fit=180x180/I0000Xise9yQw_IU.jpg)
![Mountain View, California.David Koch, a researcher at the NASA/Ames Research Center in Mountain View, California, displays an area in the sky that can be approximated by two handfuls of sky at arms length. David Koch is planning to search an area of this size with the KEPLER space telescope/photometer for as of yet undiscovered terrestrial planets in the "habitable zone". The area he plans to study is located in the Milky Way, and is known as the H-2 area. Koch plans to search this area using the KEPLER orbiting telescope, looking at 100,000 stars every four minutes for four years. In doing so, he expects to find about 400 earth sized planets as well as 800 planets twice the size of earth. Koch is double exposed with the 120 inch telescope at the Lick Observatory on Mt. Hamilton and the night sky. MODEL RELEASED [1999]](https://www.menzelphoto.com/img-get2/I0000cs253P9J3A4/fill=/fit=180x180/I0000cs253P9J3A4.jpg)
