Add Yahoo as a preferred source to see more of our stories on Google. Long, long ago a cloud of stars circled a galaxy-size black hole, safely at a distance. Then about 200 million years ago one ...

For nearly a decade, some of the most dramatic explosions in the universe have been hiding in plain sight as brief, bright flashes of blue light. New observations now suggest these outbursts are not ...

(CNN) — Astronomers have detected an astonishing celestial object emitting bright flashes of radio waves and X-rays that last for two minutes and repeat every 44 minutes. In a fresh twist, the ...

(CNN) — Astronomers have detected an astonishing celestial object emitting bright flashes of radio waves and X-rays that last for two minutes and repeat every 44 minutes. In a fresh twist, the ...

A bright flash of light was seen in the sky early Wednesday morning. The flash lasted for just a second, but lit up the whole sky. In some cases, the light was green, and in others it was blue. It ...

Astronomers have detected the closest and brightest fast radio burst ever recorded, a dazzling signal from a galaxy just 130 million light-years away. The extraordinary flash, nicknamed RBFLOAT, ...