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 ...
A plot of the orbital speeds of stars and nebulae in a galaxy versus distance from
... stars that he measured in the Andromeda Nebula appeared to be very faint ....
defined by the travel time of light over the lifetime of the universe, has not yet ..... a
planet of the same mass as Earth were orbiting the Sun at a distance of 10 AU.
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 ...
May 24, 2013 ... How can the oldest stars in the Universe be older than the Universe? ... Are
quasars really at the large distances indicated by their redshifts? What about
objects with discordant redshifts, like Stephan's Quintet? ... Thus for an
accelerating expansion the supernovae at high redshifts will appear to be fainter
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
*One in a series of invited review papers currently appearing in these.
Publications. ... process involves the problem of ordinary stars. There are ... Type
1 Seyfert galaxies show a bright star-like nucleus. ... of an emission-line cloud,
i.e. , a kind of distance scaled to ..... that quasars were bright radio sources,
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.
... of the heavens very much like its center; in size and distance it has the ratio of
a ... it is by no means absurd to search there above for the themes of our lives, ...
Figure 1 compares two nearby spiral galaxies of similar distance and type. ... Like
many AGN, this one appears as a point source of light, just as stars do. ... Initially
only AGN which were detected as radio sources were called quasars as ... Also
apparent is a faint elliptical galaxy just above the AGN, a distorted spiral galaxy ...
"We're in the 'dark matter decade' and by 2020 should be able to determine ....
got a uniquely close-up look at the brightest "magnified" galaxy yet discovered. ...
Very distant galaxies are not only faint but also appear small on the sky.
Astronomers would like to see how star formation progressed deep within...
Most of the mass in galaxies like our own Milky Way does not reside in the stars
and gas that can be directly observed with telescopes. .... The first evidence of
dark matter appeared in the 1930s, when astronomer .... Zwicky first observed the
Coma Cluster, tests of Einstein's theory were just starting, the first cosmological.