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exam 4 study guide
Terms in this set (39)
75% of galaxies are what?
spirals are mostly composed of?
gas and dust
what type of stars are mostly in spirals?
young blue stars
which galaxies have bulge and disk structures?
do ellipticals have a lot of gas and dust?
what is an elliptical galaxy shaped like?
puff ball structure
what kind of stars are in an elliptical galaxy?
giant ellipticals are usually built through
there are more irregular galaxies
in the past
there is lots of ______ _______ in irregular galaxies
the great debate
if there were one or many galaxies
the great debate was settled when __________ found the distance to ____________ using the __________ ___________ ____ ____________
Hubble ; Andromeda ; Cepheid relation of Leavitt
cepheid stars are used as standard candles for
white dwarf supernova are used as standard candles for
agn and quasars are
active galaxies are fueled by
accreting black holes
the universe is
The Universe perhaps started in a "Big Bang" and was once much
hotter, smaller, and denser
the Big Bang is evidence for
universal expansion, cosmic evolution, primordial abundances (75% Hydrogen), the cosmic microwave background
the cosmic microwave background was emitted after about ________ years
the cosmic microwave background is
present everywhere in the universe
dark matter, we can ________ it (gravitational effects), but not _______ it (no electromagnetic radiation)
Flat galaxy rotation curves
Cluster galaxy velocities are high
Galaxy clusters can contain their hot gas
Gravitational Lensing (as predicted by Einstein) - the mass of the galaxy
clusters bend the light from objects behind them
all of these things indicate
matter that we can't see
Galaxies are not the biggest structures in the Universe, they form large groups called
The Milky Way is part of a
Our group and the virgo cluster, together with others, forms the
We don't know of any structures larger than
In addition to clusters there are also _______ , areas with few or no galaxies.
Hubble showed that the farther away a galaxy is from us (distance = d), the faster it appears to be moving away (velocity = v), which is called
redshifting of light is due to
the stretching of the light waves as they travel through expanding space
For distant galaxies, the redshift is
This beginning point of the Universe is called the
the cosmic microwave background proves that the universe was once
All of these lines of evidence suggest there is about ____________ as much dark matter as there is normal matter in the Universe.
the universe is dominated by _______ dark matter
It will _____ stop expanding and will ____ getting colder and eventually we will be unable to see any galaxies except those in our local group.
never ; keep
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