When very massive stars reach the ends of their lives, they explode as supernovae, scattering elements like carbon and iron across space. Another, rarer type of explosion happens when two neutron stars, the dense remnants of dead stars, collide. This…

Mega-cap tech stocks can look nearly untouchable for years, but even the biggest winners face moments of change that make investors reassess the story. Leadership transitions, slowing growth in key markets, and questions about innovation can all reshape the outlook…

The federal government can now execute death row inmates by firing squad — a method so rarely used that only four people have died that way since the 1970s. Acting Attorney General Todd Blanche announced Friday that the Justice Department…