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By Allison S. K.

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Extra info for An Experimental Determination of the Critical Excitation Frequency for the Production of Fluorescent X-Radiation

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Baryons are subatomic particles that are generally either protons or neutrons. They are the source of stellar—and therefore galactic—luminosity. But the amount of helium in the universe, as measured by spectroscopy, indicates that there should be far more baryons than exist in the known population of galaxies. The missing baryons may be in intergalactic space, or they may be in an unknown or difficult-to-detect population of galaxies—such as low-surface-brightness galaxies. More knowledge about these galaxies may not only settle this issue but may also force us to revise drastically our current conception of how galaxies form and evolve.

But in scientific research every new tool brought to bear invariably uncovers crucial facts and deepens the understanding of fundamental principles. Radar interferometry will undoubtedly do the same for the study of SA the solid but ever restless earth. The Author Further Reading DIDIER MASSONNET entered the Ecole Polytechnique in 1979, where he began his scientific training. He later specialized in signal processing and ultimately completed a doctoral thesis on radar imaging at the University of Toulouse.

A single pixel in a radar image represents an appreciable area on the ground, perhaps 100 square meters. Such a patch will generate multiple radar reflections from the countless small targets contained within it—scattered pebbles, rocks, leaves, branches and other objects—or from rough spots on the surface. Because these many radar reflections will combine in unpredictable ways when they reach the antenna, the phase mea- INCOMING LIGHT FIRST CYCLE SLIM FILMS TAPERED FILM SECOND CYCLE RICHARD M.

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