Stellar explosions puff up giant gamma-ray bubbles
At the center of the Milky Way, a giant stellar cauldron boils. Massive stars are born and die there: each death is a supernova explosion, hurling clouds of charged particles into space.
Why Magnetic Fields Make Black Holes Quiet
At the centers of many galaxies lurk supermassive black holes, surrounded by disks of gas, cosmic dust, and stars. Their collisions can spawn gravitational waves — ripples in spacetime.
The Black Hole at the Galaxy's Center Breathes
The heart of many galaxies is a supermassive black hole. It doesn't just sit at the center; it occasionally flares brightly as it swallows surrounding gas.