relevant news

CHICAGO (Reuters) - Using powerful radio telescopes, scientists have captured a supermassive black hole just as it was belching out a jet of supercharged particles, offering a first look at how these cosmic jets are formed, they said on Wednesday.

The interaction of two galaxies is driven by the tidal pull of gravity, which draws the massive objects together (though actual collisions between stars are rare, as most of a galaxy is empty space). The billions of stars in each galaxy move individually, so that the interweaving tidal forces produce intricate and varied effects as the galaxies gradually coalesce.