Scientists Tuesday are expected to announce a major advance in the long-running quest to harness fusion, the energy that powers the sun and stars.

Lights atop a police cruiser flash at the scene of a crime in this undated file image. A pedestrian was killed during a hit-and-run accident in Orange County on Saturday, according to the Florida Highway Patrol. Troopers said a pedestrian was attempting to cross Pine Hills Road from east to west when it was struck by the front of a 2016 black Ford Fusion traveling southbound. Troopers said the driver of the Fusion fled, making a right turn on Van Allen Drive, while passengers in the vehicle fled on foot. Anyone with any information is asked to call Crimeline or the Florida Highway Patrol at 407-737-2213.