seyfert galaxies are
- an intense radio source is found to coincide with a starlike o
- compared with the total output of energy from the milky way ga
- most quasars produce their strongest emissions in which region
a particular galaxy appears round, with a nuclear region of unif
a particular galaxy appears round, with a nuclear region of unif
a typical spiral galaxy has _____ stars in a disk of diameter __
according to the hubble classification scheme, an sc galaxy has
according to the theory of self-propagating star formation, the
an astronomer studying a distant cluster of galaxies finds that
an astronomer studying a galaxy finds that its spectrum shows on
an elliptical galaxy typically contains which of the following k
as much as 90% of the matter in the universe may be unseen “dark
collisions between galaxies
dark matter in clusters of galaxies
elliptical galaxies look far less impressive than spiral galaxie
for gravitational lensing of a distant quasar to occur, the gala
globular clusters
good evidence for an original big bang that “created” our univer
how are galaxies spread throughout the universe?
how are the magellanic clouds, the two nearby satellite galaxies
how does the amount of dust and gas in a spiral galaxy vary with
how many fundamental forces are there in nature at the present t
in observations of a double quasar image produced by gravitation
in relation to the universe, what does isotropy mean?
in which of the following types of galaxies is star formation no
one difficulty with the density wave theory is that
overall, through space, galaxies are
quasars all appear to be
quasars in our universe are
recent evidence suggests that galaxies formed
seyfert galaxies are
seyfert galaxies are a distinct class of galaxies because they
spiral galaxies are classified in terms of increasing tightness
the central “engine” of an active galaxy appears to be
the cosmic background radiation is
the cosmic background radiation is the
the cosmological redshift of the light from very distant galaxie
the extreme redshifts of quasar spectra are caused by
the magellanic clouds as seen from the southern hemisphere are e
the mechanism that appears to generate two extensive regions of
the milky way galaxy is a(n)
the specific characteristics that identify most quasars are
the typical fluctuation time for the bright nesses of quasars ca
what are quarks?
what are the particles that make up protons and neutrons?
what do cosmologists study?
what do we mean when we say that the universe is homogeneous?
what is a poor cluster of galaxies?
what is a rich cluster of galaxies?
what is a starburst galaxy?
what is an einstein ring?
what is an elliptical galaxy?
what is an sbc galaxy?
what is it that keeps localized regions of space, such as things
what is the basic shape of a spiral galaxy?
what is the cosmic microwave background radiation?
what is the hubble classification for a spiral galaxy with a lar
what is the hubble classification for a spiral galaxy with a mod
what is the hubble classification for a spiral galaxy with a sma
what is the local group?
what is the most outstanding feature of a quasar compared with o
what is the range of the electromagnetic force (the maximum dist
what is the range of the gravitational force (the maximum distan
what is the “cosmological redshift”?
what makes gravity the main force determining the large scale st
what name is given to a galaxy with a smooth distribution of bri
when swirling eddies of gas-rich matter in the universe collide
which observation of quasars convinced astronomers that quasars
which of the following objects is not classified as an active ga
which of the following statements is not a characteristic of ell
which of the following terms does not name one of the four main
which of the four fundamental forces holds the electrons in the
which one of the following properties do seyfert galaxies and th
which one of the following statements is a correct description o
which scientist discovered that the equations he had derived pre
who developed the classification system that divides galaxies in
why do the spiral arms show up so clearly in spiral galaxies?
why is the milky way galaxy different from most spiral galaxies?
why is the universe expanding?