Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Accretion of Galaxies and Stars

No description
by

Cody Hancock

on 29 August 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Accretion of Galaxies and Stars

Accretion of Galaxies and Stars
Dot Point
Outline how the accretion of galaxies and stars occurred through:
-
expansion and cooling of the universe
-
subsequent loss of particle kinetic energy
-
gravitational attraction between particles
-
lumpiness of the gas cloud that allowed gravitational collapse to occur
What is Accretion?
Accretion refers to the gradual accumulation of matter in one place.
Expansion and Cooling
The expansion of the Universe results in a corresponding drop in temperature, as the energy has to be distributed throughout a larger volume of space. According to the Big Bang theory, the universe, originally in an extremely hot and dense state that expanded rapidly, has since cooled by expanding to the present state, and continues to expand today.
Subsequent loss of particle Kinetic Energy
Heat energy is a result of the kinetic energy of particles. As space expanded the temperature decreased as the particles lost kinetic energy.
Further loss of kinetic energy means that the force of gravity between atoms is greater than the force which is causing expansion.
This allows atoms to bond into molecules and molecules to accrue together, gradually gaining more gravitational force until they begin to fuse into heavier elements in the first primitive stars present in small clusters called protogalaxies.
Gravitational attraction between particles
Lumpiness of the gas cloud that allows gravitational collapse
After the "Big Bang" there was an uneven distribution of the hydrogen and helium gas cloud allowed gravitational attractiveness force to act collecting gas particles together into larger masses.
Bibliogrpaphy
http://en.wikipedia.org/wiki/Galaxy_formation_and_evolution

http://www.boredofstudies.org/wiki/5.2_The_first_minutes_of_the_Universe_released_energy_which_changed_to_matter,_forming_stars_and_galaxies#b.29_subsequent_loss_of_particle_kinetic_energy

file:///D:/users/cody.hancock/Downloads/Chapter_18_TheUniverseBegins.pdf
Full transcript