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A quasar (/ˈkweɪzɑːr/) (also quasi-stellar object or QSO) is an active galactic nucleus of very ... Quasars are found over a very broad range of distances ( corresponding to redshifts of .... quasars appeared as point sources, indistinguishable from stars, except for their ..... Relativity, Gravitation and Cosmology (Illustrated ed.) ...


So little is yet properly explained that we theoretical astrophysicists should feel deeply ... even if they were so far away that the integrated light from io11 stars failed to ... which looked like ordinary stars on photographic plates, but whose spectra ... across, corresponding to only io~~ arc seconds at a cosmological distance.


The discovery of radio sources that appeared point-like, just like stars, came ... of those faint “blue stars” that were strong sources of radio waves (Figure 1). ... A “ star” with unidentifiable lines in the ordinary visible light spectrum had to ... Despite this great distance, it is still one of the quasars closest to the Milky Way Galaxy.


Pulsars are rotating neutron stars, dense stellar cores left after a star implodes and ..... Like 3C48, 3C273 appeared starlike, but with a wispy jet off to one side. ... Evidence for the so-called cosmological distances of quasars came trickling in. ... that the quasars were surrounded by a galaxy of stars too faint to be resolved.


Intrigued, astronomers turned Hubble on what appeared to be a nearly empty patch ... the astronomers were looking for would be too faint or small for even Hubble to see. ... Its observations of Cepheid variable stars in galaxies like NGC 4603, ... The distance to quasars is so great, and their actual size so small – about the ...


The distances between galaxies are large and are often measured in megaparsecs. ... dust and gas left between the stars; (c) this means that they have no new star .... Perhaps if the dwarf galaxies were brighter, Hubble would have arranged the .... At first glance it looks like the Milky Way is at the center of the universe and it ...


And yet, it may contain all the mass of a star the size of our sun. If we were to put that super-dense black-hole-basketball into your hands, it would instantly crush you into .... At distances much larger than this, the black hole has the exact same total gravitational attraction as any other body of the same mass, just like the sun.


Jun 12, 2013 ... Astronomical Distance Determination Methods and the Light Travel Time Problem ... The nearest star is a little more than four light years distant, yet Adam ... Nevertheless, the ancient values were accepted until a few centuries ago. ... a superior planet is at quadrature, meaning that the planet makes a right ...


Apr 20, 2017 ... This means that the gravitational field of a massive object—like a galaxy—can ... At first glance, the event didn't look particularly out of the ordinary. ... locally using supernovae or Cepheid stars they get a different number from ..... they assumed their high redshifts meant they were at great distances and that ...