Astronomers have watched the birth of one of the universe's most extreme objects for the very first time - a magnetar comprising the mass of 500,000 Earths inside a sphere measuring just 12 miles ...

How do rogue planetary-mass objects -- celestial bodies with masses between stars and planets -- form? An international team of astronomers has used advanced simulations to show that these enigmatic ...

Primitive ices and gas from the earliest days of the solar system can remain trapped inside deep-space objects like comets and Kuiper Belt Objects (KBOs) for billions of years. That’s the conclusion ...