8th Grade-Ch. 4 Sec. 4 Star Systems & Galaxies
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8th Grade-Ch. 4 Sec. 4 Star Systems & Galaxies

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8th Grade-Ch. 4 Sec. 4 Star Systems & Galaxies 8th Grade-Ch. 4 Sec. 4 Star Systems & Galaxies Presentation Transcript

  • Sec. 4 Star Systems & Galaxies YouTube video-Bill Nye Galaxies song
  • Discover Activity-Why Does the Milky Way Look Hazy?
    • Using a pencil, carefully poke at least 20 holes close together in a sheet of white paper.
    • Tape the paper to a chalkboard or dark-colored wall.
    • Go to the other side of the room and look at the paper. From the far side of the room, what do the dots look like? Can you see individual dots?
    • Think It Over
    • Making Models How is looking at the paper from the far side of the room like trying to see many very distant stars that are close together? How does your model compare to the photograph of the Milky Way below?
  • The Milky Way
  • There are more stars in the sky than all the grains of sand on all the beaches in the world.
    • star system =
    • group of 2 or more stars
    • located by observing effects of star’s gravity-
      • 2 nd star makes 1 st star move back & forth
    system in which 1 star blocks the light from another eclipsing binary 3 stars triple star system 2 stars binary (double) star system
  • binary stars Hubble image of the Sirius binary system, in which Sirius B can be clearly distinguished (lower left).
  • An eclipsing binary star where the smaller, hotter companion alternately eclipses and is eclipsed by the larger companion.
  • planets around other stars
    • astronomers detect planet from effect of planet’s gravity on motion of star it revolves around
    • discovered >100 large planets
  • Planets Orbiting Other Stars video clip
  • star clusters
    • large grouping of many stars
    • 2 types:
    • open clusters
    • globular clusters
  • Densely packed w/ stars Made of few thousand stars Older stars about same age & distance from Earth Have bright supergiants & much gas & dust Round Loose, disorganized appearance Globular clusters Open clusters
  • Draw and label a picture of:
    • A binary star system
    • A triple star system
    • An eclipsing binary system
    • Open cluster
    • Globular cluster
  •  
  • galaxy
    • huge group of single stars, star systems, star clusters, dust & gas bound together by gravity
    • billions of galaxies in universe
  • 3 types of galaxies
    • pinwheel shape
    • have arms that
    • spiral out
    • look like
    • flattened balls
    • contain only
    • old stars
    • no
    • regular shape
    • young stars
  •  
  • What galaxy do we live in?
  •  
  • Milky Way galaxy
    • where our solar system is
    • barred-spiral galaxy = huge bar shaped region of stars & gas that passes thru ctr.
    • The Sun is just one of 200 billion stars in this typical barred-spiral galaxy that is about 90,000 light years in diameter.
    Milky Way looking down from above.
  • The Milky Way Galaxy
  • Where is the sun in our galaxy?
  • Galaxies video clip
  • universe
    • all of space & everything in it
    • astronomers use scientific notation = system that uses powers of 10 to write very large or very small numbers in shorter form
  • 1,200
    • 1.2 X 10 3
    scientific notation 5,400,000,000 5.4 X 10 9
    • 100,000,000,000 stars in the Milky Way Galaxy x 50,000,000,000 Galaxies ----------------------------- 5,000,000,000,000,000,000,000 stars in the universe
    How many stars are there in the universe? 5 X 10 21 in scientific notation ?
  •  
  • What is a binary star?
    • a star system with 2 stars
  • Name the main types of galaxies.
    • spiral
    • elliptical
    • irregular
  • What type of galaxy is the Milky Way?
    • spiral or barred-spiral
  • Suppose astronomers discover a galaxy that contains only old stars. What type of galaxy is it likely to be?
    • elliptical
  • What type of galaxy is it?
  • spiral, elliptical or irregular ?
  • spiral, elliptical or irregular ?
    • spiral
  • spiral, elliptical or irregular ?
    • Cigar Galaxy
  • spiral, elliptical or irregular ?
    • elliptical
    Cigar Galaxy
  • spiral, elliptical or irregular ?
    • Andromeda Galaxy
  • spiral, elliptical or irregular ?
    • spiral
  • spiral, elliptical or irregular ?
    • Galaxy NGC 4486
  • spiral, elliptical or irregular ?
    • elliptical
  • spiral, elliptical or irregular ?
    • Rainbow Galaxy
  • spiral, elliptical or irregular ?
    • spiral
  • spiral, elliptical or irregular ?
    • Large Magellanic Cloud
  • spiral, elliptical or irregular ?
    • irregular
  • spiral, elliptical or irregular
    • Galaxy NGC 1316
  • spiral, elliptical or irregular
    • elliptical
  • spiral, elliptical or irregular
  • spiral, elliptical or irregular elliptical
  • Glitter Galaxy
    • Make a galaxy with glitter
    • Name your galaxy and tell what type of galaxy it is
    • Describe the galaxy (shape, type of stars found in it, number of stars)