Giant radio galaxies are cosmic megastructures that can span millions of light-years, making them some of the largest-known ...

The U.S. Army described the helicopter as a UH-60 Blackhawk based at Fort Belvoir in Virginia. The helicopter was on a training flight. Military aircraft frequently conduct training flights in and ...

First responders desperately searching the Potomac River after an American Airlines plane collided with a military helicopter ...