12 down vast extremely luminous type of body thought to contain massive black holes, one of the most distant objects the universe. I have ?U?S?R
Is the answer pulsar or quasar? many thanks in advance.
Quasar - Wikipedia, the free encyclopedia
... the fact that they are visible at all from so far is due to quasars being the most luminous objects in the known universe. ... Quasars show the locations where massive black holes are growing rapidly ... Because quasars are extremely distant, bright, ...