NASA has discovered a supermassive black hole at the center of galaxy M87, 52 million light-years away from Earth. Estimated to be 2.6 billion times the mass of the Sun, this intriguing black hole ...

A huge sun eruption combines with speedy solar wind from a "coronal hole" for a weekend aurora show, experts predict.

NASA's Solar Dynamics Observatory just spotted a massive hole on the sun called a coronal hole. The hole appears black because it's cooler than its surroundings and is responsible for high-speed ...