Supermassive black holes have masses of more than a million suns – but their growth has slowed as the universe aged 

 Supermassive black holes have masses of more than a million suns – but their growth has slowed as the universe aged 

https://cdn.mos.cms.futurecdn.net/dWLV2ukhzMgpyGvWSBKTcB.jpg

https://www.space.com/supermassive-black-holes-growth-slows-aging-universe