The energy release can make accretion disks formidable power sources.
The accretion onto the black hole is the source of the quasar's energy.
Our scientific knowledge of nature grows through a self-correcting accretion process.
More-recent work indicated massive stars could form by accretion after all, but researchers had not actually observed it.
Matter funnels into the supermassive black hole from a ring of material circling around it and called an accretion disk.
"The only remaining doubt," he said, "is whether massive stars of much higher mass, say 50 or 100 [solar masses], will form by the same accretion process."
Instead, they have focused on what they can see, namely, the surrounding cloud of swirling matter, known as an accretion disk.
These two 'anti-quasars' provide special laboratories for us to study some of the dimmest type of accretion even seen onto a supermassive black hole.
And even some journalists wonder if a new statute on privacy might be simpler than the accretion of judge-made law that has grown up in recent years.
For decades, astronomers have been confident that relatively low-mass stars such as our sun form by the gradual accretion, or buildup, of mass from a disk of gas and dust.
They go around in the plane of the blackboard, say, and so this matter cannot fall radially in but it will fall in and spiral in and forms what we call an accretion disk around the neutron star.
