Black Hole That Periodically Ejects Its Inner Disk As Jets Discovered

Astronomers observing a disk of matter spiralling into a black hole in our galaxy have discovered that the black hole periodically hurls the inner portion of the disk into space as jets travelling at near the speed of light.

Biological Activity the Likely Culprit of Atmospheric Nitrous Oxide Increases

New research suggests that the changing concentration of nitrous oxide in the atmosphere is largely a result of biological activity.

Geophysicists Develop Model to Describe Huge Gravity Anomaly of Hudson Bay Region

Using a new approach to analyzing planetary gravity fields, two geophysicists, Mark Simons at the California Institute of Technology and Bradford Hager at M.I.T., have shown that incomplete glacial rebound can account for a substantial portion of the Hudson Bay gravity anomaly. Geophysicists Develop Model to Describe Huge Gravity Anomaly of Hudson Bay Region December 1997 97

Caltech Question of the Month

Question of the Month Submitted by John Propst, Fullerton, California.

Answered by Ken Libbrecht, Caltech professor of physics.

Light travels at the speed of light, and is created traveling at light speed. When Einstein invented the theory of special relativity, he postulated that the speed of light was a constant.

Caltech Biologists Pin Down Chain of Reactions That Turn On the Duplication of DNA

Caltech biologists have pinpointed the sequence of reactions that triggers the duplication of DNA in cells. Caltech Biologists Pin Down Chain of Reactions That Turn On the Duplication of DNA October 1997 97

Caltech Scientists Devise First Neurochip

Caltech researchers have invented a "neurochip" that connects a network of living brain cells wired together to electrodes incorporated into a silicon chip. Caltech Scientists Devise First Neurochip October 1997 97

3-D Images of Martian Terrain To Be Shown To the Tune of Holst

Dramatic 3-D pictures of Mars will be shown during a performance of Gustav Holst's "Mars" at the first Caltech-Occidental Concert Band performance of the season. 3-D Images of Martian Terrain To Be Shown To the Tune of Holst October 1997 97

First Fully Automatic Design of a Protein Achieved by Caltech Scientists

In the October 3 issue of the journal Science, Stephen L. Mayo, an Assistant Professor of Biology and a Howard Hughes Medical Institute Assistant Investigator, and chemistry graduate student Bassil I. Dahiyat report on their success in constructing a protein of their choice from scratch.

Possible Planet-Forming Disk imaged by Caltech Radio Astronomers

A giant disk of gas and dust over 10 times the size of our own solar system has been detected rotating around a young star in the constellation of Auriga. Possible Planet-Forming Disk imaged by Caltech Radio Astronomers August 1997 97

Caltech Question of the Week: Will Future Mars Colonies Utilize Local Martian Rocks and Soil for Building Materials?

Question of the Month Submitted through e-mail by Dave Cooley, Costa Mesa, California, and answered by Albert Yen, Caltech grad student in planetary science; and Peter Goldreich, professor of astrophysics and planetary physics.

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