November 17, 2006 |
An international team of scientists Thursday reported that rising temperatures were steadily transforming the Arctic -- warming millions of square miles of permafrost, promoting lush greenery on previously arid tundras and steadily shrinking the annual sea ice.
March 19, 2004 |
A 100-foot-wide space rock hurtled past Earth only 26,500 miles away -- the closest asteroid ever detected by astronomers before it actually made its approach. The harmless flyby occurred at 2:08 p.m. PST. "We figure that on average, something this size hits the Earth every two to three years," said astronomer Paul Chodas of NASA's Near-Earth Object Program. "We've never detected them out in space, either approaching or receding. This is the closest."
March 20, 2004 |
A detailed survey of birds and butterflies in Britain shows a population decline of 54% to 71%, a finding that suggests the world may be undergoing the sixth big extinction in Earth's history, this one caused by humans. In a series of population surveys that combed virtually every square yard of England, Scotland and Wales over 40 years, more than 20,000 volunteers counted each bird, butterfly and native plant they could find.
November 23, 2003 |
The distinctive sounds of Earth, intended as a message from a small blue planet to life forms beyond it, are echoing homeward in a rare recording being sold at the Planetary Society in Pasadena. "Murmurs of Earth -- The Voyager Interstellar Record" is an unusual time capsule that was launched aboard the Voyager I and Voyager II spacecrafts in 1977 to communicate the images and sounds of Earth to inhabitants of the far reaches of space.
CALIFORNIA | LOCAL
November 7, 1996 |
Dramatically pushing back the emergence of life on Earth by nearly 400 million years, scientists Wednesday said they have found chemical traces in the world's oldest known sediments that suggest that simple life forms thrived 3.85 billion years ago. The discovery could be the first evidence of the primordial microbes that arose when inanimate matter organized itself into the earliest living molecules.
July 24, 1994 |
For astronomers and star warriors who already view the night sky with foreboding, the cataclysm that convulsed Jupiter last week was a possible preview of the fate of Earth, which one day may be caught off-guard by a stream of natural warheads--comets or asteroids on a collision course with the home planet.
February 11, 1993 |
Seismic echoes from a powerful Chinese nuclear test have helped U.S. scientists develop a new process for looking deep within the Earth that has already produced remarkably sharp images of the white-hot layer of gooey rock surrounding the planet's core. Using the new process, John E. Vidale and Harley M. Benz of the U.S. Geological Survey in Menlo Park were able to detect an "island" as small as 60 miles across in the layer atop the Earth's molten iron core.
CALIFORNIA | LOCAL
August 29, 1990
Was the CIA misreading the Soviet economy ("CIA Misread Soviet Economy," Part A, Aug. 3) since 1950 or misleading the American government? Surely, the leaders of the CIA would rather be seen as well-meaning bunglers than as disinformers, especially in view of recent events in Eastern Europe; yet I wonder if the agency wasn't really being artful in its overestimation of Soviet economic achievements during the last 40 years. The U.S.
CALIFORNIA | LOCAL
March 14, 1988 |
Most children are not taught that the Earth is round until they are about 10 years old and in the fourth grade, according to a survey conducted for the National Science Teachers Assn. As a result, they rely on their own perceptions and assume that the Earth is flat. The study found that 95% of second graders thought that the Earth is flat. The proportion who knew the Earth to be round did not exceed 50% until the fourth grade.