Monday August 10, 2009 Updated 3:15 AM PDT
The rocky debris from a wandering comet is filling the sky with shooting stars these nights, just as...
When it was launched to great fanfare nearly a year ago, some feared the Large Hadron Collider would...
In the first test of its planet-hunting ability, NASA's new spacecraft Kepler has shown that it can indeed detect planetary objects...
Chronicle 8.6.09 6:56 PM
West Nile virus appears to be less widespread in California this year than last so far, but public health and vector control experts...
Chronicle 8.5.09 4:00 AM
Space shuttle Endeavour and its seven astronauts returned to Earth on Friday, completing a long but successful construction job that...
Chronicle 8.1.09 4:00 AM
In what might embarrass less adventurous souls, astronaut Koichi Wakata is returning to Earth with the underwear he kept on for a...
Chronicle 7.31.09 4:00 AM
A federal panel recommended Wednesday that pregnant women and others at high risk for serious complications from the swine flu get...
Chronicle 7.29.09 3:57 PM
After 11 days together in orbit, Endeavour undocked from the international space station on Tuesday and began its trip home, leaving...
Chronicle 7.29.09 4:00 AM
Doctors have known since the 1970s that dense breast tissue can mask tumors, but it is only in the past few years, with the advent of...
Chronicle 7.27.09 7:55 PM