August 17, 1999 |
launched two years ago amid vigorous protests over its radioactive fuel supply--will fly within 800 miles of Earth at 8:28 tonight, taking pictures as it passes on its way to Saturn. Critics had warned that the 72 pounds of radioactive plutonium on board Cassini posed an unacceptable threat to human life if the craft crashed, either on launch or during the fly-by. But the Oct. 15, 1997, launch was successful, and protests have mostly quieted since then.
July 20, 1990 |
A national center to research global environmental and climate changes will be established at UC Davis, University of California officials announced Thursday. To be funded with an initial $6-million grant from the U.S Department of Energy, the project is expected to help better understand the causes and consequences of the greenhouse effect and find ways to avoid catastrophic climate changes. The greenhouse effect is caused by carbon dioxide and other gases that accumulate in the atmosphere.
September 24, 1986 |
The Soviet nuclear reactor accident at Chernobyl vented amounts of long-lived radioactivity comparable to that released by all the atmospheric nuclear weapon tests since the dawn of the Atomic Age, but that poses no serious worldwide health hazard, scientists at the Lawrence Livermore Laboratory reported Tuesday. The conclusion is based on study of the amount of cesium-137 released by the explosion and fire at the Chernobyl nuclear power plant about 60 miles from Kiev in the Soviet Ukraine.