SI base units redefinition

A redefinition of SI base units is scheduled to come into force on 20 May 2019. The kilogram, ampere, kelvin, and mole will then be defined by setting exact numerical values for the Planck constant (h), the elementary electric charge (e), the Boltzmann constant (k), and the Avogadro constant (NA), respectively. Read more wikipedia Nature 550, 313 (2017) PhysicsWorld — SI gets a makeover The…

Black hole pictured for first time — in spectacular detail

Astronomers have finally glimpsed the blackness of a black hole. By stringing together a global network of radio telescopes, they have for the first time produced a picture of an event horizon — a black hole’s perilous edge — against a backdrop of swirling light. For more details see: https://www.nature.com/articles/d41586-019-01155-0 Image of a black hole at the centre of the galaxy M87 obtained by the…