Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...

This is the gargantuan black hole that lives at the centre of our galaxy, pictured for the very first time. Known as Sagittarius A*, the object is a staggering four million times the mass of our Sun.

The galaxy Centaurus A, which has a supermassive black hole at its core. Image: X-ray (Chandra): NASA/CXC/SAO/D. Bogensberger et al; X-ray (IXPE): NASA/MSFC; Optical: ESO; Image Processing ...