GREENBELT, Md. — NASA’s sun-focused Solar Terrestrial Relations Observatory, or STEREO, twin spacecraft unexpectedly detected particles from the edge of the solar system last year. This helped ...

Launch of NASA’s STEREO spacecraft is scheduled for Wednesday, Oct. 25, aboard a Boeing Delta II rocket from Pad 17-B at Cape Canaveral Air Force Station, Fla. The launch window is 8:38 to 8:53 p.m.

Using data collected by NASA’s STEREO spacecraft, researchers at the Southwest Research Institute (SwRI) in San Antonio, Texas, and the National Solar Observatory in Tucson, Arizona, have developed ...