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Even if black holes existed then, there was no mechanism to funnel material toward them and turn them into quasars. Consequently, few quasars are observed at very high redshifts—that is, more than 11 billion years ago. But in the following aeons, galaxies began to assemble and collide, producing the relatively large number of quasars observed 10 billion light-years from the earth. Finally, the expansion of the universe carried most galaxies away from one another, A New Look at Quasars June 1998 Copyright 1998 Scientific American, Inc.

Nemeroff. , 1995. The Corticotropin-Releasing Factor (CRF) Hypothesis of Depression: New Findings and New Directions. C. B. Nemeroff in Molecular Psychiatry, Vol. 1, No. 4, pages 336–342; September 1996. The Neurobiology of Depression Scientific American June 1998 Copyright 1998 Scientific American, Inc. 49 A New Look at Quasars Recent observations from the Hubble Space Telescope may reveal the nature and origin of quasars, the mysterious powerhouses of the cosmos by Michael Disney 52 Scientific American June 1998 Copyright 1998 Scientific American, Inc.

So shrimp farmers would do well to pick suitable locations away from mangroves. And there are other simple changes that would help both the environment and the bottom line. For example, farm managers commonly broadcast large amounts of food over their ponds once or twice a day; however, many smaller feedings at more frequent intervals, combined with the use of feeding trays, would require less food and cause less waste. Improved feeds—formulations that use greater amounts of vegetable protein and less fish meal—are more digestible, appear to last longer in the water and also produce less waste.

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