Did cosmic collision flood medieval Earth with gamma rays?

Astronomers believe they've worked out the source of a mysterious burst of gamma rays that irradiated the Earth in the 8th century.

New evidence claimed for dark matter

Physicists say they've found more evidence for the existence of dark matter, in the form of gamma rays emanating from the center of the galaxy.

Crab Pulsar gamma rays baffle scientists

Scientists say the Crab Pulsar is blasting out gamma rays at a higher rate than can be explained by current scientific models.       

Strange gamma ray flash caused by black hole eating star

A mysterious gamma ray flash observed by the Swift satellite in late March was probably caused by a star being swallowed by a massive black hole, astronomers have concluded.

Bizarre cosmic explosion observed

Astronomers are poring over data from what they say is one of the most puzzling cosmic blasts ever observed.

Thunderstorms on Earth blast antimatter into space

Scientists have for the first time discovered that antimatter is regularly being produced on Earth - by thunderstorms.

Huge structure discovered at Milky Way's heart

NASA's Fermi Gamma-ray Space Telescope has discovered a massive structure spreading halfway across the Milky Way.