"They're so heavy and dense that the electrons and protons that make up atoms have been crushed together into neutrons. What makes magnetars unique is their extreme magnetic fields, billions of ...

Indeed, biological samples containing lots of hydrogen are usually “deuterated” – replacing hydrogen with deuterium – before they are placed in a neutron beam. However, there are some special cases ...

He called it a neutron, and imagined it as a paired proton and electron. There was no evidence for any of these ideas. Chadwick kept the problem in the back of his mind while working on other things.

Neutron star mergers are collisions between ... events could yield interesting insights into how matter behaves at extreme densities. The behavior of matter at extremely high densities is ...