Star Systems and Galaxies Sect. 4

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Star Systems and GalaxiesSect. 4

• Made by Alberina Dreshaj, Anna Doucette,
  Michayla Anja, and Chelsea Merrill.

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Binary Star

• Star systems that have two stars.

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Open Clusters

• A star cluster that has a loose, disorganized
  appearance and contains no more than a few
  thousand stars.

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Eclipsing Binary

• A system in which one star periodically blocks
  the light from another star.

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Globular Clusters

• Large groupings of older stars.

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Galaxy

• A huge group of single stars, star systems, star
  clusters, dust, and gas bound together by gravity.

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Spiral Galaxies

• Galaxies with bulges in the middle and arms that
  spiral outward, like pinwheels.

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Elliptical Galaxies

• Galaxies that look like round flattened balls.

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Irregular Galaxies

• Galaxies that do not have regular shapes.

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Quasars

• An enormously bright, distant galaxy with a giant
  black hole at its center.

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Universe

• All space and everything in it.

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Scientific Notation

• A mathematical method of writing numbers using
  powers of ten.

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3 ObjectivesObjective number 1

• Define a star system.
• A star system is a group of 2 or more stars.

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Objective number 2

• Identify the major types of galaxies.
• The major types of galaxies are spiral,
  elliptical, and irregular.

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Objective number 3

• Explain how astronomers describe the scale of the
  universe as all of space and everything in it.
• Astronomers describe the scale of the universe as
  all of space and everything in it by studying
  everything in it such as objects as close as the
  moon and as distant (far away) as quasars.

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Checkpoints and Figures!

• Interpreting Diagrams-
• Algol appears brighter when the dim star
  of the binary star passes in front of the
  brighter star and eclipses it.

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More checkpoints!

• Checkpoint- Globular clusters are large groupings
  of older stars.
• Checkpoint- A quasar is an enormously bright,
  distant galaxy with a giant black hole at its
  center.
• Interpreting Diagrams- The sun is located halfway
  out from the middle.
• Checkpoint- About 25,000 light-years.
• Calculating- 3000000000000000000 meters.

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Sect 4 Assessment.

• 1.a) A binary star is a star system that has 2
  stars.
• b) Yes, because each star system has 2 stars that
  are called double stars or binary stars.
• c) The term is appropriate because when the dim
  star goes in front of the brighter star, it is
  eclipsing it and there are 2 stars.
• 2.a) Spiral, Elliptical, Irregular.
• b) The milky way is a spiral galaxy.
• c) Elliptical.
• 3.a) The scientific notation is a mathematical
  method of writing numbers using power of 10.
• b) How the scientific notation is useful to
  astronauts is it helps them determine
  light-years.
• c) The Cats Eye.

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Thank you for watching!