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astro exam 4 practice test #3 of 3
Terms in this set (48)
Galaxy A receding from Galaxy B at a velocity of 7500 km/s, from the perspective of Galaxy B. Hubble's Law says that V=Ho x D. About how far is Galaxy A from Galaxy B? Use a value of 75 km/s/mpc for Hubble's constant
which is the smallest?
the solar system
a quasar in a galaxy that is merging with another galaxy would be
more luminous because of a greater supply of fuel
why can't we see back the whole way to the big bang?
the radiation scatters off matter frequently so the universe is opaque
which one of the following is TRUE?
smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the milky way
which statement about spiral galaxies is FALSE?
a type "c" spiral has tight, smooth arms
which of the following makes a meson?
an up quark and an anti-down quark
about how many dots are seen in the Hubble Deep Field image, just within that image? What are the dots seen in the Hubble Deep Field?
which of the following statements is FALSE?
we are at the center of the universe
what do quasars look like?
individual starts in the milky way
how many times bigger is the local group of galaxies in which the milky way resides than the milky way galaxy itself?
about 10 times bigger
which of the following is TRUE?
at the time that the big bang expansion began, all matter and energy in our observable universe was compressed into a single point of space
how might a nearby neighbor change the shape of this galaxy?
the merger of two spiral galaxies may give rise to an elliptical galaxy
what is exchanged between different particles in order to make the forces work?
which properties of spiral galaxies allow us to subclassify them as Sa, Sb, Sc?
size of bulge and extent of spiral arms
what is hot dark matter?
hypothetical low mass particles that travel close to the speed of light but do not emit radiation
what types of fundamental particles are in an atom?
just up quarks, down quarks, and electrons
about how many dots are seen in the hubble deep field image, just within that image? what are the dots seen in the hubble deep field?
which source generates the most energy over its lifetime?
a standard candle is
an easily recognizable astronomical object whose absolute brightness is confidently known
what is the temperature of the universe at present?
about 2.7 degrees kelvin
which is the largest distance?
the distance from earth to the virgo cluster of galaxies
which have more massive supermassive black holes, spiral galaxies like andromeda or elliptical galaxies like cygnus A?
among these choices, which is the last thing that happens in the history of the universe?
binding of electrons to nuclei
galaxy a is 300 mpc from galaxy b. hubble's law says that V=Ho x D. About how fast is galaxy a receding from the perspective of galaxy b? use a value of 75 km/s/mpc for hubble's constant.
what is the braneworld theory?
the idea that extra dimensions exist around us but we are confined to a membrane with just three spatial dimensions
which of the following are flavor of quarks?
top and up
how many galaxies are there in the observable universe?
fifty to a hundred billion (5x10^10 - 10^11)
in Carol's (and Kaku's) theory of eternal inflation
many baby universes form, most of which are dead, but some which are similar to ours
which is not a fundamental particle?
what is an SBc galaxy?
a barred spiral with loose, lumpy spiral arms
which of the following statements is definitely FALSE?
there is an absence of space beyond the boundaries of our observable universe
which one of the following is FALSE?
galaxy collisions destroy most of the stars in the galaxies involved
if the objects seen in the past are galaxies, how might they have changed?
the galaxies were more irregular and patchy in the past than they are at present
what did the wilkinson microwave anisotropy probe (WMAP) measure?
differences in the temperature of radiation coming from the big bang from different directions
what color of stars are found in the young star clusters in the disk of the whirlpool galaxy?
an up quark has charge +2/3, a down quark has charge -1/3, and a strange quark has charge -1/3. The Sigma^0 particle is formed by a combination of two down quarks and one strange quark. What is its charge?
How do astronomers measure the mass of a supermassive black hole?
by measuring the speed at which stars move in its vicinity
which is a reason that we know dark energy is a major component of the universe?
the universe is flat and regular matter doesn't contribute enough energy density
what element is only produced in a supernova explosion?
in what part of spiral galaxies do new stars form?
in the spiral arms
when examining a spectrum of particular galaxy, an astronomer notices that
the galaxy is very likely to be one of the nearest ones to the milky way
what type of boson is responsible for the electromagnetic force?
which is true about cold dark matter?
cold dark matter particles travel more slowly than hot dark matter particles
which of the following areas have the most massive black holes (those with the highest masses)?
in the centers of spiral galaxies
when supermassive black holes have access to "fuel" what are they?
quasars and active galactic nuclei (AGNs)
which of the following s thought to have to do with producing a 1 minute long gamma-ray burst?
the universe formed helium nuclei in a process called nucleosynthesis. At that time, what fraction of the mass was converted to helium nuclei (2 protons and 2 neutrons)?
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