Astronomers have long been puzzled by two strange phenomena at the heart of our galaxy. First, the gas in the central ...

The night sky will dazzle this week as the Lyrid meteor shower kicks off its annual display, marking the return of one of the oldest and most reliable celestial shows of the year.

The quasi-periodic eruptions of X-rays from a black hole 300 million light-years away are unlike any researchers have ever seen before.

Sunlight reaching Earth’s surface isn’t as stable as we might think—it’s actually fluctuated dramatically over the decades due to pollution and clean air efforts. An international team of researchers ...