A magnitude 4.2 earthquake occurred at 6:16 p.m. Friday roughly 3 miles northwest of Palomar Observatory, causing shaking across San Diego County and beyond, according to the U.S. Geological Survey.

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. SAN DIEGO — An earthquake shook part of San ...

For astrophysicist Mansi Kasliwal, her appointment to the historic Palomar Observatory as the new director was a full-circle moment. The California Institute of Technology announced her new position ...

9:05 a.m. Oct. 3, 2023: An earlier version of this story said Edwin Hubble used the label “N” on a photographic plate to mean nebula. It stood for nova. Los Angeles was once the best place in the ...

For the past three years, astronomers at the California Institute of Technology’s Palomar Observatory in Southern California have been using the High Performance Wireless Research and Education ...

Cal Tech was taking no chances with the world’s most precious piece of glass. As it dared the perils of Southern California highways last week, the 200-inch mirror for the giant Mt. Palomar telescope, ...