Quasars or quasi-stellar radio sources are the most energetic and distant
members of a class of objects called active galactic nuclei (AGN). Quasars are
extremely luminous and were first identified ...
Now appear before You with a new contrivance of glasses [occhiale], drawn from
the ... for example, nine miles appear as though they were only one mile distant.
... but when I follow the serried multitude of the stars in their circular course, my ...
of the heavens very much like its center; in size and distance it has the ratio of a ...
Feb 9, 2015 ... The vast majority of these objects were ordinary sunlike stars in Earth's own ... In
many cases, that host galaxy is so faint it is not detected, leaving only the quasar
visible. ... (The finite speed of light means that larger physical distances ... small
size of quasars also means they appear star-like when viewed ...
Jun 19, 2015 ... Quasars were first identified as high-redshift sources of electromagnetic ... In
optical telescopes, quasars look like single points of light (i.e. point ...
Astronomers detected what appeared to be a faint blue star at the ... moot and
today the cosmological distance of quasars is accepted by almost all researchers
Apr 27, 2003 ... H.01 How many stars, galaxies, clusters, QSO's etc. in the Universe? ... does this
mean they are that far away now or were that far away when the light left them? ...
for example, for every Sun-like star there are about 200 faint red M dwarfs. ...
enough to see nearby, much less at large cosmological distances.
Initially only AGN which were detected as radio sources were called quasars ...
the spectral lines did not appear at appropriate wavelengths for atoms of any ... In
each case shown in Figure 5 faint nearby emission was discovered from stars in
a galaxy. ... The distance between the quasar and the galaxy is one-seventh the ...
Some of these milky nebulae have spiral shapes to them and others look like ...
The distances between galaxies are large and are often measured in
megaparsecs. ... Those favoring a large Milky Way with the spiral nebulae inside
it were ... little dust and gas left between the stars; (c) this means that they have
no new star ...
More specifically, this means that being less— perhaps far less—than half a
second of arc ... The radio appearance of a typical quasar is relatively similar to
the ... Ordinary stars have a continuous energy distribution in their spectra to a
first order ..... If cosmological distances for quasars offered no difficulties either,
problem Even before NASA launched Hubble, engineers were hard at work
building ... —the Wide Field Planetary Camera 2 (WFPC2)—meant for installation
by ...... and quasars, the intensely bright, star-like objects appearing at galactic
distances .... he called the cosmological constant Astronomers don't yet know
study a wide range of questions in galaxy evolution and cosmology. ... for
unresolved faint quasars and AGN in the crude combine images using a ...
inconsistent with that of ordinary stars, 7 pointlike objects with colors consistent
with quasars or .... The newly formed U300,B450,V606,I814 catalogs were
matched using the ...