New model can measure the mass of pulsars even if they’re all alone

New model can measure the mass of pulsars even if they’re all alone

Measuring the mass of stars, planets and moons in the universe usually relies on studying how their motion relates to other bodies nearby. For some objects that are on their own in space, however, this method is impossible. But research published in the journal Science Advances describes a new technique that could prove useful. Scientists led by the University …



Discovery of white dwarf companions of millisecond pulsars

Discovery of white dwarf companions of millisecond pulsars

 When a star with a mass of roughly ten solar masses finishes its life, it does so in a spectacular explosion known as a supernova, leaving behind as remnant “ash” a neutron star. Neutron stars have masses of one-to-several Suns, but they are tiny in size, only tens of kilometres. Neutron stars spin rapidly, and …



The golden anniversary of black-hole singularity

The golden anniversary of black-hole singularity

When a star collapses forming a black hole, a space-time singularity is created wherein the laws of Physics no longer work. In 1965 Sir Roger Penrose presented a theorem where he associated that singularity with so-called ”trapped surfaces” that shrink over time. That hypothesis -one of the results of the general theory of relativity- is …