Submitted by Anonymous (not verified) on Fri, 1997-01-24 08:00
Submitted by Virginia Salazar, Whittier, Calif. and answered by Dr. Paul Sternberg, Professor of Biology, Caltech
In most cases, the sequence of DNA making up a gene is copied accurately when a cell divides. This accurate process ensures that each cell is like its parent cell. DNA consists of a string of DNA bases, the letters in the genetic alphabet.
Submitted by Anonymous (not verified) on Fri, 1997-01-17 08:00
Question of the Month Submitted by Bob and Pat Gaskill, Orange County, and answered by Dr. William Bottke, Texaco Prize Fellow, Division of Geological and Planetary Sciences, Caltech.
Submitted by Anonymous (not verified) on Mon, 1997-01-13 08:00
TORONTO — Sophisticated imaging techniques applied on the Keck Telescope have uncovered a new structure in a nearby active galaxy.
The image and associated research are being presented today at the semiannual meeting of the American Astronomical Society. Alycia Weinberger, a doctoral student in physics at the California Institute of Technology, and her collaborators have used the computer-intensive technique of speckle imaging and the 10-meter W. M. Keck Telescope atop Mauna Kea, Hawaii, to image the nucleus of NGC 1068.
Submitted by Anonymous (not verified) on Thu, 1997-01-09 08:00
Question of the Month Submitted by Michael Dole, Covina, Calif., and answered by Peter Goldreich, Lee A. DuBridge Professor of Astrophysics and Planetary Physics at Caltech.
You're undoubtedly thinking of Venus as the planet that spins east to west. In other words, if you arrived on Venus in the morning, the sun would be in the west and would set in the east. The only thing is that it would set about four Earth-months later! That's because a day on Venus lasts for 243 of our Earth-days.
Submitted by Anonymous (not verified) on Fri, 1997-01-03 08:00
Submitted by Jim Early, Orange County, and answered by Dr. Roger Blandford, Richard Chace Tolman Professor of Theoretical Astrophysics and Executive Officer for Astronomy; and David Hogg, Caltech graduate student in physics.
A similar question was asked by Shawn McCord, age 8, of Covina.
Submitted by Anonymous (not verified) on Fri, 1996-12-27 08:00
Question of the Month Submitted by Rick Conner, Laguna Niguel, and answered by Donald Burnett, Professor of Geochemistry, Caltech.
The answer is yes.
Elements are numbered according to the number of protons they contain. For example, hydrogen, the first element on the periodic table, has one proton. Oxygen has eight, iron has 26, and gold has 79. Uranium, with 92 protons, is the heaviest element that has been detected elsewhere in the universe by astronomers.
Submitted by Anonymous (not verified) on Thu, 1996-12-19 08:00
Submitted by Ann Marchillo, Glendora, Calif., and answered by Matt Fraser and Patrick Chuang, graduate students in environmental engineering at Caltech.
Ozone is a molecule containing three atoms of oxygen, and is known by the chemical symbol "O3." The stuff we breathe is "O2," which contains two atoms of oxygen. The "ozone hole" is a decrease in the amount of ultraviolet-absorbing ozone in the upper part of the earth's stratosphere, about 10 miles above ground level.
Submitted by Anonymous (not verified) on Sun, 1996-12-15 08:00
SAN FRANCISCO—In two closely related presentations today at the annual American Geophysical Union conference, Caltech geophysicist Don Anderson will describe work suggesting a radical new interpretation of how Earth operates inside. The work is based on recently declassified satellite imagery as well as a revisiting of the issue of primordial helium (the 3He isotope) within Earth.
Submitted by Anonymous (not verified) on Thu, 1996-12-12 08:00
Submitted by Dean Bessette, Huntington Beach, Calif., and answered by Dave Stevenson, George Van Osdol Professor of Planetary Science, California Institute of Technology
As everyone with a refrigerator knows, ice cubes tend to shrink over time. And if you have an old-style refrigerator, you may have observed that the ice molecules go directly from the ice cubes to the walls of the freezer compartment without ever becoming liquid water. This is the process of sublimation, and your question about its relevance to the water found on the moon is a good one.
Submitted by Anonymous (not verified) on Thu, 1996-12-05 08:00
PASADENA— Researchers have singled out a brain enzyme that seems to be essential in memory retention and learning.