Classifying galaxies Big Bang Active galaxies Our Local Group Random $ 200 $ 200$200 $ 200 $400 $ 400$400 $ 400 $600 $ 600$600 $ 600 $ 600 $800 $ 800$800 $ 800 $ 800 $ 1000$1000 $ 1000 $ 1000 $ 1000

$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?

$1000 Sa 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

$800 An 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.

$200 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

$200 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?

$ 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

$200 70% How much of the universe might be dark energy?

$400 Luminous matter accounts for what percentage of the Universe’s total mass? 4%

$600 Galaxies are redshifting The fact that photons are stretched as they travel and space itself is expanding through time comes from the fact that

$800 distance The greater a galaxies redshift the greater it’s

$1000 Mrs. Painter’s favorite astronomer is Neil deGrasse Tyson