For over a century, the Cambrian arthropod Helmetia expansa remained a mystery. Discovered by paleontologist Charles ...

Using ESA's XMM-Newton satellite, Italian astronomers have observed a Galactic X-ray binary system known as 4U 0728-25.

A new chapter in X-ray history has been written over hundreds of miles above our planet. A medical X-ray of a human hand has been taken successfully in space for the first time. The remarkable feat ...