Astronomers have traced a mysterious blast of X-rays to a star that, like a cosmic action hero, just refused to die.

Hollow atoms are special atoms with multiple missing electrons in their inner shells, while their outer shells are still ...

This stunning Hubble view of spiral galaxy UGC 11397 captures more than graceful arms and glowing stars—it hides a ravenous ...

These processes can be monitored by measuring the high-energy electromagnetic radiation and particles that they emit including x-rays, ultraviolet light and gamma rays.

A new analysis of BL Lacertae by NASA’s Imaging X-ray Polarimetry Explorer sheds light on the emission mechanisms of active ...

A faint radio glow reveals a million-light-year halo enveloping one of the earliest galaxy clusters, hinting that energetic ...

The Andromeda galaxy, also known as Messier 31 (M31), is the closest spiral galaxy to the Milky Way at a distance of about ...

An international team of astrophysicists have uncovered a possible origin of fast X-ray transients (FXTs) — mysterious, ...

The discovery marks the most distant mini halo ever found, doubling the distance of any previously known example. It offers ...

NASA has released a breathtaking new image of the Andromeda Galaxy, our closest galactic neighbor. Also known as Messier 31, or M31, Andromeda is located about 2.5 million light-years from Earth.

Two international teams zoned in on a potential answer to a decades-long mystery surrounding ephemeral cosmic X-rays.