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Classifying galaxies
Big BangActive
galaxiesOur Local
GroupRandom
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$400 $400 $400 $400 $400
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$200
Elliptical
What type of galaxy is on the far left hand side of the
tuning fork
$400
E0
A spherical galaxy (like M87) would be classified as
$600
Sa
A spiral galaxy with a large central bulge and tight arms
would be classified as
$800
E0 is circular, E7 is cigar shaped
How are an E0 and an E7 different?
$1000Sa hasLarger center (nucleus) and tighter
arms
How can you tell an Sa from an Sc
$200
increasing
Is the expansion rate of the universe increasing or
decreasing?
$400
Farther it is from us
Hubble’s laws tell us that the more red shift a galaxy has the_____________________ (farther or nearer) it is from us.
$600
expanding
Because the galaxies further from us are moving away faster, Astronomers know
that the universe is
$800An event that started the expansion of the universe
What is the Big bang?
$1000
Contrast how dark matter and dark energy have different roles in the future of our universe.
Dark matter would slow down the universe’s expansion through gravitational influence, dark energy is accelerating the expansion.
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blazar
If we are looking at an active galaxy directly down through a jet are we seeing a radio galaxy or a blazar?
$400
Accretion disk (with infalling matter)
To provide radiate energy, active galaxies need both a
black hole and an
$600
Interactions with nearby galaxies or star clusters
What do active galaxies need to feed their central engines?
$800
Name the parts of an active galaxy
Jets, torus, accretion disk and black hole
$1000
Look for jets, torus, accretion disk and black hole
Draw and label an active galaxy
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Small ellipticals
What type of galaxies compose our Local Group?
$400
Virgo
What is the nearest huge cluster of galaxies to our
Local Group
$600
Irregular
What type of galaxies are the Large and Small Magellanic
Clouds?
$800
Andromeda and the Milky Way
What are the largest members of the Local Group?
$1000
45 galaxies total, Most are dwarf ellipticals and irregulars and three spirals: Milky Way, Andromeda and M33 are spirals
Describe the population, size and types of galaxies found in
our Local Group
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70%
How much of the universe might be dark energy?
$400
Luminous matter accounts for what percentage of the Universe’s total mass?
4%
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Galaxies are redshifting
The fact that photons are stretched as they travel and
space itself is expanding through time comes from the
fact that
$800distance
The greater a galaxies redshift the greater it’s
$1000
Mrs. Painter’s favorite astronomer is
Neil deGrasse Tyson
