Quasar Center

Quasars $\rightarrow$ "things that look like stars but give out radio waves", or "quasi-stellar radio sources", to which a Chinese astrophysicist in 1964 said, "Let's just call them quasars". Nobody back then understood why these objects had tremendous redshifts, which meant they must be generating unheard-of levels of radiation energy. Today, we understand that the accretion disks of supermassive black holes can convert not an insignificant fraction of infalling matter into energy even before it reaches the black hole event horizon.

"In this picture, one of these jets appears as a cloudy streak, measuring some 200 000 light-years in length. Of these very bright objects, 3C 273 is the brightest in our skies. If it was located 30 light-years from our own planet—roughly seven times the distance between Earth and Proxima Centauri, the nearest star to us after the sun—it would still appear as bright as the sun in the sky." {Obtained from the website.}

Only after reading only "30 light-years", I chose "Super massive, active black hole". Whether a quasar that we can observe today is still alive as active is ambiguous in the way the question wants for an answer. Fortunately, I guessed the mind correctly. No way to ask question unless give up the right to answer correctly. I think a mean to resolve ambiguity can encourage more people to try to answer the question.

In fact, the nomenclature of black hole is just making people curious about a sort of hole which is actually an object but not a hole; just because of its attracting characteristic. This is miss leading for curiosity making.