galactic fountain

How we discovered that supermassive black holes can power enormous ‘galactic fountains’

How we discovered that supermassive black holes can power enormous ‘galactic fountains’

A fountain in a garden pond could shoot a plume of water to roughly three metres in height. By comparison, the famous fountain on Lake Geneva launches a plume of water up to 140m into the air. Now imagine a fountain launched from the centre of a galaxy, with a supermassive black hole acting as the pump. How far do you think this plume would extend? The answer is over 100,000 light years.