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Title: quasars Post by: gcks on February 16, 2005, 10:36:14 AM what is a quasar?
Why are there quasars that are exactly the same (like twins) even though they are quite distant with each other?How do the theories of Einstein (of relativity) explain that? Title: Re: quasars Post by: Yevaud on February 16, 2005, 10:44:00 AM One possible theory:
http://www.space.com/scienceastronomy/blackhole_history_030128-1.html --Yev "No one understands Quantum Physics." Richard Feynman Title: Re: quasars Post by: yale on February 16, 2005, 11:29:58 AM "Why are there quasars that are exactly the same (like twins)"
If to mega-scale blackholes have about the same mass, are located at about the same distance, and have similar quantities of mass being sucked into them, their appearance should be quite similar. Title: Re: quasars Post by: Astronuc on February 18, 2005, 08:06:32 AM Why are there quasars that are exactly the same (like twins) . . . ? Where did you read that? They could be similar according to our limited observation, but same, as in identical, would seem unlikely. Quote When radio telescopes were first turned on the heavens, point sources of radio waves were discovered (along with spread-out regions of emission along our Milky Way). Astronomers using ordinary visible-light telescopes turned toward these radio points and looked to see what was there. In some cases a supernova remnant was found, in others, a large star-birth region, in others a distant galaxy. But in some places where point sources of radio waves were found, no visible source other than a stellar-looking object was found (it looked like a point of like --- like a star does). These objects were called the "qausi-stellar radio sources", or "quasars" for short. Later, it was found these sources could not be stars in our galaxy, but must be very far away --- as far as any of the distant galaxies seen. We now think these objects are the very bright centers of some distant galaxies, where some sort of energetic action is occurring, most probably due to the presence of a supermassive black hole at the center of that galaxy (supermassive = made up from a mass of about a billion solar masses). from Frequently Ask Questions's About Quasars (http://www.phys.vt.edu/~jhs/faq/quasars.html#q1), compiled by Dr. John Simonetti of the Department of Physics at Virginia Tech. Title: Re: quasars Post by: xir on February 22, 2005, 11:35:30 AM quicky, has the gravitational well theory been disproved, where the red shift is cased by light escaping the gravity of the black hole. Rather than by the great distance of the objects.
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