A secretive technology investment group that is a top backer of Elon Musk’s companies will close to external investors, after racking up such big gains that it is no longer dependent on outside ...

NASA is getting ready to launch twin satellites for a study on the sun's energy, and a University of Iowa professor is ...

In recent days, Republican circles in Washington have buzzed with speculation that former Trump administration official Katie Miller, an aide to Elon Musk and wife of one of the president's closest ...