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Classification of Things. Dr. Harold Williams Montgomery College Planetarium http://Montgomerycollege.edu/Departments/planet/. Who, Why, What, Where, When, and How. Who and What are classification questions Who and Why are Religious questions

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classification of things

Classification of Things

Dr. Harold Williams

Montgomery College Planetarium

http://Montgomerycollege.edu/Departments/planet/

who why what where when and how
Who, Why, What, Where, When, and How
  • Who and What are classification questions
  • Who and Why are Religious questions
  • What, Where, When, and How are Scientific Questions
  • Who, Why, What, Where, When, and How are Philosophical Questions
  • Classification spans both Religion and Science by asking Who and What!
some common classifications in science
Some Common Classifications in Science
  • Periodic Table of the Elements
  • Particle Physics and the Standard Model
  • Fundamental Interactions of Physics
  • Electron Orbitals or Probability Distributions, the Auf Bau
  • Geological Time Scales
  • Biology and the Tree of Life
  • Spectral Classification of the Stars
  • Hertzsprung-Russell Diagram and Luminosity Classes as well as spectral classifications
  • Types of Star Clusters
  • Types of Galaxies
fundamental particles http en wikipedia org wiki elementary particles
Fundamental Particleshttp://en.wikipedia.org/wiki/Elementary_particles
quarks
Quarks

Proton

Neutron

  • Protons and neutrons are made of quarks
  • Up quark (u) has charge +2/3
  • Down quark (d) has charge -1/3
fundamental forces according to the wikipedia
Fundamental Forces according to the Wikipedia
  • Electromagnetism http://en.wikipedia.org/wiki/Electromagnetic_interaction
  • Weak Nuclear Force http://en.wikipedia.org/wiki/Weak_interactions
  • Electroweak http://en.wikipedia.org/wiki/Electroweak_interaction
  • Strong Nuclear Force http://en.wikipedia.org/wiki/Strong_interaction
  • Gravity http://en.wikipedia.org/wiki/Gravity
electrons in atoms auf bau
Electrons in Atoms, Auf Bau
  • In quantum mechanics an electron in an atom does not orbit in the usual sense
  • We can know only the probability of finding an electron at a particular spot
tree of life
Tree of Life
  • Mapping genetic relationships has led biologists to discover this new “tree of life.”
  • Plants and animals are a small part of the tree.
  • Suggests likely characteristics of common ancestor.
slide16
Lines in a star’s spectrum correspond to a spectral type that reveals its temperature http://en.wikipedia.org/wiki/Spectral_type

(Hottest) O B A F G K M (Coolest)

slide17
Remembering Spectral Types

(Hottest) O B A F G K M (Coolest)

  • Oh, Be A Fine Girl, Kiss Me
  • Oh, Be A Fine Guy, Kiss Me
  • Oh, Be A Fine Gay, Kiss Me
  • Only Boys Accepting Feminism Get Kissed Meaningfully
pioneers of stellar classification
Pioneers of Stellar Classification
  • Annie Jump Cannon and the “calculators” at Harvard laid the foundation of modern stellar classification
slide19
H-R diagram depicts:

Temperature

Color

Spectral Type

Luminosity

Radius

Luminosity

Temperature

slide21
Open cluster: A few thousand loosely packed stars

http://en.wikipedia.org/wiki/Open_clusters

slide22
Globular cluster: Up to a million or more stars in a dense ball bound together by gravity http://en.wikipedia.org/wiki/Globular_cluster
slide28
Hubble Ultra Deep Field

Elliptical Galaxy

EllipticalGalaxy

Spiral Galaxy

slide29
Hubble Ultra Deep Field

Elliptical Galaxy

EllipticalGalaxy

Spiral Galaxy

slide30
Hubble Ultra Deep Field

Elliptical Galaxy

EllipticalGalaxy

Irregular Galaxies

Spiral Galaxy

a better name
A better name
  • Spiral galaxies might be better named by calling them Disk galaxies!
  • Some Disk galaxies have no or little spiral structure, but they are still have disks.
slide32
Hubble’s galaxy classes

Spheroid

Dominates

Disk Dominates

categories
Categories
  • http://en.wikipedia.org/wiki/Categories_%28Aristotle%29
  • Categories By Aristotle Written 350 B.C.E Translated by E. M. Edghill another one.
  • Categories List
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