Since the formation of Earth approximately 4.5 billion years ago, the convection and release of hot magma in its mantle layer ...

An international team of astronomers has conducted a multiwavelength study of an X-ray binary designated 1eRASS ...

Gravitational distortions produced by distant galaxies show a slight—but notable—disagreement with Einstein's predictions.

NASA selects two proposals for missions to observe X-ray and far-infrared wavelengths of light from space for additional ...

Astronomers have identified three ultra-massive galaxies -- nearly as massive as the Milky Way -- already in place within the first billion years after the Big Bang. This surprising discovery was made ...

Scientists using observations from NASA's Neil Gehrels Swift Observatory have discovered, for the first time, the signal from a pair of monster black holes disrupting a cloud of gas in the center of a ...

Roughly 400,000 years after the Big Bang, the universe cooled just enough to allow photons to escape from the primordial ...