October 14, 2006 |
Wobbles or variations in the Earth's orbit and tilt are associated with extinctions of rodent and mammalian species, Dutch scientists reported Wednesday in the journal Nature. They studied rodent fossil records in central Spain dating back 22 million years and found that the rise and fall of mammal species was linked to changes in Earth's behavior, which caused cooling periods. The researchers found two cycles corresponding to the disappearance of rodent species. One lasted 2.
September 30, 2006 |
Earth is close to the warmest it has been in the last million years, especially in the part of the Pacific Ocean where potentially violent El Nino weather patterns are born, climate scientists have reported. This doesn't mean there will be more frequent episodes of El Nino, which can disrupt normal weather around the world, but these wild patterns could be stronger when they occur, said James Hansen of NASA's Goddard Institute for Space Studies in New York. Earth is within 1.
February 12, 2000 |
The space shuttle Endeavour roared off the launch pad Friday at the start of a long-delayed mission that is aimed at producing the best-ever three-dimensional images of Earth's surface. The six astronauts on board will spend 11 days in space bouncing radar signals off cities, fields, mountains, forests and other features that shape the planet between its polar regions.
February 22, 2000 |
Astronauts aboard the space shuttle Endeavour ended their ambitious Earth-mapping work Monday after some anxious moments closing a hatch. Bad weather forced them to consider landing at a seldom used strip in New Mexico. Following a final mapping pass over Australia, the astronauts began to stow their equipment for today's scheduled landing, but there was trouble with the 20-story radar mast deployed just hours after their Feb. 11 liftoff.
January 18, 2001
Feeling big? Go to http://earthobservatory.nasa.gov/Newsroom/ NewImages/Images/earth_lights_lrg.jpg for an idea of how small and insignificant you really are. Using a series of satellite images originally intended for the study of clouds by moonlight, scientists at the National Aeronautics and Space Administration compiled an image of our planet at night. It's cool, but it's also a little unnerving--particularly north of the equator.
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.
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.